Name | Location | Locator View | Connector End View |
|---|---|---|---|
ABS Indicator Relay (ABS-Air) | In the MaxiFuse® block/ mini-relay center, position C | -- | |
ABS Indicator Relay (ABS-Hydraulic) | In the MaxiFuse® block/ mini-relay center, position C | -- | |
ABS Relay (ABS-Air) | In the flasher/ relay center, position 3-B | -- | |
Accessory Relay | In the flasher/ relay center, position 1-A | -- | |
Air Brake Dryer | On the outboard side of the left frame rail | ||
Air Brake Pressure Gauge Lamp | On the left side of the IP, to the right of the steering column, in the right accessory trim plate, inserted into the gauge | ||
Air Intake Heater (Cat® Diesel) | Between the air intake housing and the intake manifold | -- | |
Air Intake Heater Relay (Cat® Diesel) | On the top right side of the cylinder head | -- | |
C1 (ring terminal) | On the vehicle's engine harness, to the air intake heater relay | -- | |
C2 (4 cavities) (C127) | On the Cat® diesel engine harness, to the air intake heater relay | ||
C3 (ring terminal) | On the Cat® diesel engine harness, to the air intake heater relay | -- | |
Ammeter | On the left side of the IP, to the right of the steering column, in the right accessory trim plate, the bottom gauge | ||
Automatic Transmission (AT) Modulator (Cat® Diesel) | On the lower left side of the transmission | ||
Automatic Transmission (AT) Modulator (GM Diesel) | On the lower left side of the transmission | ||
Automatic Transmission Fluid (ATF) Temperature Gauge | On the left side of the IP, to the right of the steering column and right of the automatic transmission (AT) selector control | ||
Automatic Transmission Fluid (ATF) Temperature Gauge Sensor | On the lower right rear of the radiator, on the transmission oil cooler inlet fitting | ||
Automatic Transmission (AT) Oil Temperature Gauge | On the left side of the IP, to the right of the steering column and right of the automatic transmission (AT) selector control | ||
Automatic Transmission (AT) Oil Temperature Gauge Sensor | On the lower right rear of the radiator, on the transmission oil cooler inlet fitting | ||
Automatic Transmission (AT) Selector Control | On the left side of the IP, to the right of the steering column, on the center accessory trim plate | ||
Backup Lamps Switch (Automatic Transmission) | On the lower right side of the transmission | ||
Backup Lamps Switch (Manual Transmission) | On the top of the transmission, left of the gear shift lever | ||
Battery | On the top of the crossmember or relocated by the upfitter | -- | |
Battery Negative Cable Extension | From the right frame rail (G414) to the left frame rail (G413) | -- | |
Battery, Center (Triple Batteries) | On the top of the crossmember, between the left battery and the right battery, or relocated by the upfitter | -- | |
Battery, Left (Dual Batteries) | On the top of the crossmember, the left battery, or relocated by the upfitter | -- | |
Battery, Left (Triple Batteries) | On the top of the crossmember, the left battery, or relocated by the upfitter | -- | |
Battery, Right (Dual Batteries) | On the top of the crossmember, the right battery, or relocated by the upfitter | -- | |
Battery, Right (Triple Batteries) | On the top of the crossmember, the right battery, or relocated by the upfitter | -- | |
Body Ground Strap | From the lower left side of the exterior bulkhead (G107) to the outboard side of the left frame rail (G105) | -- | |
Brake Fluid Level Switch | On the left side of the brake master cylinder reservoir | ||
Brake Fluid Level Switch | On the left side of the brake master cylinder reservoir | ||
Charge Indicator (Generator) Diode (D200) (Cat® Diesel) | In the IP harness, in the main harness, the in-line diode, approximately 4 cm (1.6 in) to the left of the data link connector (DLC) breakout | -- | -- |
Clutch/ Starter Interlock Switch (Cat® Diesel) | On the clutch pedal bracket | ||
Clutch/ Starter Interlock Switch (Gasoline) | On the clutch pedal bracket | -- | |
Clutch/ Starter Interlock Switch (GM Diesel) | On the clutch pedal bracket | ||
Clutch/ Starter Interlock Switch Jumper Harness (C215, 2 cavities) (Automatic Transmission) (Cat® Diesel) | On the clutch switch jumper, to the IP harness, at the clutch pedal support bracket | ||
Clutch/ Starter Interlock Switch Jumper Harness (C215, 2 cavities) (Automatic Transmission) (Gasoline) | On the clutch switch jumper, to the IP harness, at the clutch pedal support bracket | ||
Clutch/ Starter Interlock Switch Jumper Harness (C215, 2 cavities) (Automatic Transmission) (GM Diesel) | On the clutch switch jumper, to the IP harness, at the clutch pedal support bracket | ||
Data Link Connector (DLC) (Cat® Diesel) | Under the left side of the IP | Data Link Communications Component Views | |
Data Link Connector (DLC) (Cat® Diesel) | Under the left side of the IP | ||
Data Link Connector (DLC) (Gasoline) | Under the left side of the IP | Data Link Communications Component Views | |
Data Link Connector (DLC) (Gasoline) | Under the left side of the IP | ||
Data Link Connector (DLC) (GM Diesel) | Under the left side of the IP | Data Link Communications Component Views | |
Data Link Connector (DLC) (GM Diesel) | Under the left side of the IP | ||
Daytime Running Lights (DRL) Control Module | In the left kick panel, in the DRL harness | ||
Daytime Running Lights (DRL) Relay | In the mini-relay center, position D | ||
Driver Information Center (DIC) (Cat® Diesel) | On the left side of the IP, part of the instrument panel cluster (IPC) | -- | |
C1 (11 cavities) | In the IP harness, to the DIC | ||
C2 (11 cavities) | In the IP harness, to the DIC | ||
Driver Information Center (DIC) (Gasoline) | On the left side of the IP, part of the instrument panel cluster (IPC) | -- | |
C1 (11 cavities) | In the IP harness, to the DIC | ||
C2 (11 cavities) | In the IP harness, to the DIC | ||
Driver Information Center (DIC) (GM Diesel) | On the left side of the IP, part of the instrument panel cluster (IPC) | -- | |
C1 (11 cavities) | In the IP harness, to the DIC | ||
C2 (11 cavities) | In the IP harness, to the DIC | ||
Electronic Brake Control Module (EBCM) (ABS-Air) | On a bracket, on the left side, upper exterior bulkhead, on the top of the air brake application valve | -- | |
C1 (30 cavities) | In the electronic brake control harness, to the EBCM | ||
C2 (18 cavities) | In the electronic brake control harness, to the EBCM | ||
Electronic Brake Control Module (EBCM) (ABS-Hydraulic) | On the inboard side of the left frame rail, to the rear of number one crossmember, on the bracket | -- | |
C1 (2 cavities) | In the electronic brake control harness, to the EBCM | ||
C2 (24 cavities) | In the electronic brake control harness, to the EBCM | ||
Engine Coolant Temperature (ECT) Gauge Sensor (Cat® Diesel) | On the right side of the engine, on the right rear side of the coolant outlet housing | ||
Engine Coolant Temperature (ECT) Gauge Sensor (Gasoline) | On the intake manifold water jacket, behind the thermostat housing coolant outlet | ||
Engine Coolant Temperature (ECT) Gauge Sensor (GM Diesel) | On the left side of the left cylinder head, at the front of the cylinder head | ||
Engine Ground Cable, Left (Gasoline) | From the lower left side of the engine (G120 ) to the left frame rail (G121) | -- | |
Engine Oil Pressure (EOP) Gauge Sensor (Cat® Diesel) | On the left side of the engine block, on a tee, pointing up | ||
Engine Oil Pressure (EOP) Gauge Sensor and Fuel Pump (FP) Switch (Gasoline) | On the top rear of the engine near the bell housing | ||
Engine Oil Pressure (EOP) Gauge Sensor and Fuel Pump (FP) Switch (Gasoline) | On the top rear of the engine near the bell housing | ||
Engine Oil Pressure (EOP) Gauge Sensor and Fuel Pump (FP) Switch (GM Diesel) | On the top of the engine, on the center of the engine | ||
Engine Oil Pressure (EOP) Gauge Sensor and Fuel Pump (FP) Switch (GM Diesel) | On the top of the engine, on the center of the engine | ||
Engine Shutoff Solenoid (GM Diesel) | On the top of the engine, on the center front of the engine, part of the electronic fuel injection pump assembly | ||
Engine Speed Governor Control Module | On the top of the engine, on the left front of the engine | ||
Ether Injection Control Valve (Cat® Diesel) | In the engine compartment, on the right side of the bulkhead | ||
Ether Injection Control Valve Relay (Cat® Diesel) | In the MaxiFuse© block/ mini-relay center, position E | -- | |
Ether Injection Diode (D101) (Cat® Diesel) | In the engine harness, in the main harness, approximately 20 cm (7.9 in) from P100, toward the engine | -- | -- |
Ether Injection/ Engine Coolant Temperature (ECT) Sensor (Cat® Diesel) | On the rear of the engine, on the cylinder head | ||
Exhaust Brake Control Valve | On the left rear side of the back-of-the-cab crossmember | ||
Exhaust Brake Switch | On the center of the IP | ||
Exhaust Gas Recirculation (EGR) Electronic Vacuum Regulator Solenoid Valve | On the front right side of the intake manifold | ||
Flasher/ Relay Center | In the right side of the IP | -- | |
Fuel Heater (Cat® Diesel) | On the left side of the engine, part of the fuel/ water separator (fuel filter) | ||
Fuel Heater (GM Diesel) | On the inboard side of the right frame rail, part of the fuel filter assembly | ||
Fuel Lift Pump (GM Diesel) | On the inboard side of the right frame rail | ||
Fuel Pump (FP) Relay (Gasoline and Cat® Diesel) | In the MaxiFuse© block/ mini-relay center, position E | -- | |
Fuel Sender and Fuel Pump (FP) (Gasoline) | On the outboard side of the left frame rail, in the fuel tank | ||
Fuel Sender and Fuel Pump (FP) (Gasoline) | On the outboard side of the left frame rail, in the fuel tank | ||
Fuel Solenoid Driver (GM Diesel) | On the top of the engine, on the center of the front of the engine, part of the electronic fuel injection pump assembly | ||
Fusible Link N (rust) (Diesels) | In the engine harness, to the generator B+ stud | -- | -- |
Fusible Link P (blue) (Cat® Diesel and Gasoline) | In the engine harness, in the main harness at starter solenoid C2, B+ stud | -- | -- |
Fusible Link R (gray) (ABS-Hydraulic) | On the positive battery cable end | -- | -- |
Fusible Link S (blue) (Cat® Diesel) | In the engine harness, in the main harness, approximately 35 cm (14 in) from the breakout to the starter solenoid | - | - |
Fusible Link S (blue) (Gasoline) | In the engine harness, in the main and starter harness breakout, at the breakout to the starter solenoid | -- | -- |
Fusible Link S (blue) (GM Diesel) | In the engine harness, in the main harness, approximately 23 cm (9 in) from the breakouts to the generator and starter solenoid, toward the IP | -- | -- |
Generator (Cat® Diesel) | On the right side of the engine | -- | |
C1 (ring terminal) | In the engine harness, to the generator Bat terminal | -- | |
C2 (ring terminal) | In the engine harness, to the generator R terminal | -- | |
C3 (2 cavities) | In the engine harness, to the generator | ||
Generator (Gasoline) | On the upper right side of the engine | -- | |
C1 (ring terminal) | In the engine harness, to the generator Bat terminal | -- | |
C2 (4 cavities) | In the engine harness, to the generator | ||
Generator (GM Diesel) | On the upper right side of the engine | -- | |
C1 (ring terminal) | In the engine harness, to the generator Bat terminal | -- | |
C2 (4 cavities) | In the engine harness, to the generator | ||
Generator Ground Strap (Cat® Diesel) | From the generator ground to the engine (cylinder head) ground | -- | |
Generator Ground Strap (Gasoline) | From the generator ground to the engine (cylinder head) ground | -- | |
Generator Ground Strap (GM Diesel) | From the generator ground to the engine (intake manifold) ground | -- | |
Glow Plug Relay (GM Diesel) | On the top of the engine, on the left rear side of the engine | ||
C1 (ring terminal) | In the vehicle engine harness, to the glow plug relay | -- | |
C2 (ring terminal) | In the glow plug harness, to the glow plug relay | -- | |
C3 (4 cavities) | In the GM diesel engine harness, to the glow plug relay | ||
Hazard Warning Switch | On the left side of the IP, to the right of the steering column, on the right accessory trim plate | ||
HAZARD Warning Name Plate | On the left side of the IP, to the right of the steering column, on the right accessory trim plate, | ||
Headlamp, Left High/ Low | On the left front side of the hood | ||
Headlamp, Right High/ Low | On the right front side of the hood | ||
Headlamps Switch | On the left side of the IP, to the left of the instrument panel cluster (IPC) | ||
Heated Moisture Ejector Valve | On bottom rear of the primary air reservoir | ||
HI IDLE Switch (Cat® Diesel) | On the left side of the IP, to the right of the steering column, on the left IP accessory trim plate | ||
HI IDLE Switch (GM Diesel) | On the left side of the IP, to the right of the steering column, on the left IP accessory trim plate | ||
Hourmeter | On the left side of the IP, to the right of the steering column, on the center accessory trim plate, the top gauge | ||
Horn, A-Note (High) | Behind the front bumper, on the right front side of the crossmember | ||
Horn, F-Note (Low) | Behind the front bumper, on the right front side of the crossmember | ||
IP Fuse Block | In the center of the IP, to the left of the instrument panel cluster (IPC) | -- | |
IP Lamps Dimmer Switch | On the left side of the IP, to the left of the instrument panel cluster (IPC) | ||
Ignition Coil | On the center rear of the intake manifold | -- | |
C1 (2 cavities) | In the engine harness to the ignition coil | ||
C2 (2 cavities) | In the engine harness jumper to the distributor ignition (DI) control module | ||
Ignition Relay | In the mini-relay center, position A | -- | |
Ignition Switch | On the top side of the lower steering column | -- | |
C1 (5 cavities) | In the IP harness, to the ignition switch | ||
C2 (4 cavities) | In the IP harness, to the ignition switch | ||
Instrument Panel Cluster (IPC) | In the left side of the IP | ||
Knock Sensor (KS) Module | On the top of the engine, on the left front of the engine | ||
Lighting Relay | In the MaxiFuse© block/ mini-relay center, position F | ||
Low Air Pressure Switch | Under the IP, above the accelerator pedal | ||
Low Air Pressure Switch | Under the IP, above the accelerator pedal | ||
Low Engine Coolant Level Indicator Switch (Cat® Diesel) | On the right side of the radiator, on the lower left bottom side of the radiator surge tank | ||
Low Engine Coolant Level Indicator Switch (Cat® Diesel) | On the right side of the radiator, on the lower left bottom side of the radiator surge tank | ||
Low Engine Coolant Level Indicator Switch (GM Diesel) | On the right side of the radiator, on the lower left bottom side of the radiator surge tank | ||
Low Engine Coolant Level Indicator Switch (GM Diesel) | On the right side of the radiator, on the lower left bottom side of the radiator surge tank | ||
MaxiFuse® Block/ Mini-Relay Center | On the right side of the IP, under the access cover | -- | |
MaxiFuse® Block 1 | On the right side of the IP, under the access cover, on the left side of the MaxiFuse® block/ mini-relay center | -- | |
MaxiFuse® Block 2 | On the right side of the IP, under the access cover, on the center of the MaxiFuse® block/ mini-relay center | -- | |
Mini-Relay Center | On the right side of the IP, under the access cover, on the right side of the MaxiFuse® block/ mini-relay center | -- | |
Multifunction Alarm Module (MFAM) (Cat® Diesel) | In the center of the IP harness, behind the right access panel | -- | |
C1 (16 cavities) | In the IP harness, to the MFAM | ||
C2 (4 cavities) (with Automatic Engine Shutdown) | In the IP harness to the MFAM | ||
Multifunction Alarm Module (MFAM) (Gasoline) | In the center of the IP, behind the right access panel | ||
Multifunction Alarm Module (MFAM) (GM Diesel) | In the center of the IP, behind the right access panel | ||
Multifunction Alarm Module (MFAM) Jumper (Shunt) (Cat® Diesel w/ out Automatic Engine Shutdown) | In the IP harness, taped to the main harness, between the IP fuse block and MFAM breakouts. | ||
Neutral Switch (Automatic Transmission) | On the lower right side of the transmission | ||
Park / Neutral Position (PNP) Switch (Column-mounted) | On the top of the left front fender | ||
Park and Turn Signal Lamp, Left Front | On the top of the left front fender | ||
Park and Turn Signal Lamp, Right Front | On the top of the right front fender | ||
Park Brake Indicator Switch (ABS-Air) | On the right side of the IP, on the park brake valve | ||
Park Brake Indicator Switch (ABS-Air) | On the right side of the IP, on the park brake valve | ||
Park Brake Indicator Switch (ABS Hydraulic) | On the left kick panel, to the right rear of the park brake lever | ||
Park Brake Indicator Switch (ABS Hydraulic) | On the left kick panel, to the right rear of the park brake lever | ||
Positive Battery Cable | From the battery (+) terminal to the starter solenoid | -- | |
Power Brake (P/B) Booster Fluid Flow Switch | On the left side of the bulkhead, behind the brake master cylinder, on the top of the P/B booster pump housing | ||
Power Brake (P/B) Booster Pump Motor (ABS-Hydraulic) | On the upper left engine-side of the bulkhead, at the brake master cylinder | -- | |
Power Brake (P/B) Booster Pump Motor (ABS-Hydraulic) | On the upper left engine-side of the bulkhead, at the brake master cylinder, part of the power brake (P/B) booster pump | ||
Power Brake (P/B) Booster Pump Motor Relay | In the flasher/ relay center, above position 3-A | ||
Powertrain Control Module (PCM) (Cat® Diesel) | On the left rear side of the engine block | ||
Powertrain Control Module (PCM) (Gasoline) | Under the right side of the IP | -- | |
C1 (32 cavities) | In the engine harness, to the PCM | ||
C2 (24 cavities) | In the engine harness, to the PCM | ||
Powertrain Control Module (PCM) (GM Diesel) | Under the right side of the IP | -- | |
C1 (32 cavities) | In the engine harness, to the PCM | ||
C2 (24 cavities) | In the engine harness, to the PCM | ||
C3 (32 cavities) | In the engine harness, to the PCM | ||
Primary Fuel Filter (GM Diesel) | On the inboard side of the right frame rail | ||
Primary Fuel Heater (GM Diesel) | On the inboard side of the right frame rail, part of the fuel filter assembly | ||
Primary Water-In-Fuel Sensor (GM Diesel) | On the inboard side of right frame, forward, part of the primary fuel/ water separator (fuel filter) | ||
Radiator Shutter Control Valve (Diesel) | On the left side of the radiator core support | ||
Radiator Shutter/ Engine Coolant Temperature (ECT) Switch (Cat® Diesel) | On the right side of the engine, on the upper left side of the coolant outlet extension housing | ||
Radiator Shutter Control Valve Relay (GM Diesel) | On the top center, left side of the engine | ||
Secondary Fuel Filter (GM Diesel) | On the inboard side of the right frame rail | ||
Secondary Fuel Heater (GM Diesel) | On the inboard side of the right frame rail, part of the fuel filter assembly | ||
Secondary Water-In-Fuel Sensor (GM Diesel) | On the inboard side of the right frame rail, behind the primary, part of the secondary fuel/ water separator (fuel filter) | ||
Speedo Adapter | Under the right side of the IP | ||
Starter Motor (Cat® Diesel) | On the lower right side of the engine | -- | |
Starter Motor (Cat® Diesel and HD Starter w/ Overcrank Protection) | On the lower right side of the engine | -- | |
Starter Motor (Gasoline) | On the lower right side of the engine | -- | |
Starter Motor (GM Diesel) | On the lower right side of the engine | -- | |
Starter Motor Ground Cable (Cat® Diesel) | From the starter motor end ground stud (G101) to the right frame rail ground (G100) | -- | |
Starter Motor Ground Cable (Cat® Diesel and HD Starter w/ Overcrank Protection) | From the starter motor right side ground stud (G103) to the right frame rail ground (G100) | -- | |
Starter Motor Ground Cable (Cat® Diesel and HD Starter w/ Overcrank Protection) | From the starter motor right end ground stud (G101) to the right frame rail ground (G100) | -- | |
Starter Motor Ground Cable (GM Diesel) | From the starter motor ground (G103) to the right frame rail ground (G100) | -- | |
Starter Relay | In the flasher/ relay center, position 2-A | -- | |
Starter Solenoid (Cat® Diesel) | On the lower right side of the engine | -- | |
C1 (ring terminal) | On the positive battery cable to the starter solenoid Bat stud, at the starter motor | -- | |
C2 (ring terminal) | In the engine harness, to the starter solenoid Bat stud, at the starter motor | -- | |
C4 (ring terminal) | In the engine harness, to the starter solenoid Sol stud, at the starter motor | -- | |
Starter Solenoid (Cat® Diesel and HD Starter w/ Overcrank Protection) | On the lower right side of the engine | -- | |
C2 (ring terminal) | In the engine harness, to the starter solenoid, at the starter motor | -- | |
C4 (ring terminal) | In the engine harness, to the starter solenoid, at the starter motor | -- | |
Starter Solenoid (Gasoline) | On the lower right side of the engine | -- | |
C1 (ring terminal) | On the positive battery cable to the starter solenoid, at the starter motor | -- | |
C2 (ring terminal) | In the engine harness, to the starter solenoid, at the starter motor | -- | |
C4 (ring terminal) | In the engine harness, to the starter solenoid, at the starter motor | -- | |
Starter Solenoid (GM Diesel) | On the lower right side of the engine | -- | |
C1 (ring terminal) | On the positive battery cable to the starter solenoid, at the starter motor | -- | |
C2 (ring terminal) | In the engine harness, to the starter solenoid, at the starter motor | -- | |
C4 (ring terminal) | In the engine harness, to the starter solenoid, at the starter motor | -- | |
Starter Solenoid Ground Cable (Cat® Diesel and HD Starter w/ Overcrank Protection) | From the starter solenoid ground stud (G124) to the starter motor end ground stud (G101), part of the starter and starter solenoid assembly | -- | -- |
Starter Thermal Switch (Cat® Diesel and HD Starter w/ Overcrank Protection) | On the lower right side of the engine, on the end of the starter motor | ||
Stoplamps Switch (ABS-Air) | On the brake pedal support | -- | |
C1 (4 cavities) | In the IP harness, to the stoplamps switch | ||
C2 (2 cavities) | In the IP harness, to the stoplamps switch | ||
Stoplamps Switch (ABS-Hydraulic) | On the brake pedal support | -- | |
C1 (4 cavities) | In the IP harness, to the stoplamps switch | ||
C2 (2 cavities) | In the IP harness, to the stoplamps switch | ||
Stoplamps Switch Interface Module (Cat® Diesel) | In the IP, left of the IP fuse block | -- | |
Throttle Body Fuel Injector 1 | On the top of the engine, inside the throttle body, on the left side | ||
Throttle Body Fuel Injector 2 | On the top of the engine, inside the throttle body, on the right side | ||
Turbocharger (TC) Wastegate Regulating Solenoid Valve | On the top of the engine, on the right front of the engine, on the intake manifold | ||
Turn Signal Switch | On the left side of the steering wheel , part of the multifunction switch | ||
Turn/ Hazard Flasher | In the flasher/ relay center, position 1-B | -- | |
Two-Speed Rear Axle Shift Motor (Electric-Operated Shift System) | In the rear axle, left of center on the forward side | ||
Two-Speed Rear Axle Shift Relay (Electric-Operated Shift System) | On the front right side of the crossmember, forward of the rear axle | ||
Two-Speed Rear Axle Shift Switch (Electric-Operated Shift System) | At the manual transmission shift lever | ||
Upfitter Connector (C212, 23 cavities) | Under the left side of the IP, by the left kick panel | ||
Upfitter Connector Jumper (Shunt) (23 cavities) | Under the left side of the IP, by the left kick panel | ||
Upfitter IP (+) Junction Block | Under the left side of the IP, on the left kick panel | -- | |
Upfitter Provision for Windshield Washer Motor | In the engine harness, the pink wire, taped to the main harness, approximately 15 cm (5.9 in) from pass-through P100, at the exterior bulkhead | -- | |
C102 (7 cavities) | In the forward lamps harness, to the engine harness, on the right lower front of the hood, under the right headlamp | -- | |
C104 (2 cavities) (Cat® Diesel) | In the engine harness, below the intake manifold, on the top of the left front side of the engine | -- | |
C106A (1 cavity) (Cat® Diesel) | In the engine harness, to the engine harness, near the starter solenoid breakout | -- | |
C106A (1 cavity) (Cat® Diesel and HD Starter w/ Overcrank Protection) | In the starter motor overcrank protection jumper harness, to the engine harness, near the starter solenoid breakout | -- | |
C106B (1 cavity) (Cat® Diesel) | In the engine harness, to the engine harness, near the starter solenoid breakout | -- | |
C106B (1 cavity) (Cat® Diesel and HD Starter w/ Overcrank Protection | In the starter motor overcrank protection jumper harness, to the engine harness, near the starter solenoid breakout | -- | |
C108 (15 cavities) (GM Diesel) | In the engine harness, to the GM diesel engine harness, on the top left center of the engine, forward | -- | |
C110 (10 cavities) (GM Diesel) | In the engine harness, to the GM diesel engine harness, on the top left center of the engine, in the center | -- | |
C112 (3 cavities) (Cat® Diesel) | Near starter solenoid on right rail | -- | |
C112 (3 cavities) (GM Diesel) | In the engine harness, to the radiator shutter jumper harness, on the top of the left side of the engine, at the rear | -- | |
C116 (5 cavities) (Cat® Diesel) | In the engine harness, to the fuel tank harness, at the right frame rail, near the starter | -- | |
C116 (5 cavities) (Gasoline) | In the engine harness, to the fuel tank harness, at the right frame rail, near the starter | -- | |
C116 (5 cavities) (GM Diesel) | In the engine harness, to the fuel tank harness, at the right frame rail, near the starter | -- | |
C117 (3 cavities) (Gasoline and Cat® Diesel) | In the engine harness, to the two-speed rear axle jumper harness, near the frame rail, by the starter | -- | |
C117 (3 cavities) (GM Diesel) | In the engine harness, taped to the harness near the frame rail, by the starter (not used) | -- | |
C119 (7 cavities) (Cat® Diesel) | In the ABS-hydraulic jumper harness, to the ABS-hydraulic chassis harness, in the engine compartment, on the left side of the bulkhead | -- | |
C119 (7 cavities) (Gasoline) | In the engine harness, to the ABS-hydraulic chassis harness, in the engine compartment, on the left side of the bulkhead | -- | |
C119 (7 cavities) (GM Diesel) | In the ABS-hydraulic jumper harness, to the ABS-hydraulic chassis harness, in the engine compartment, on the left side of the bulkhead | -- | |
C127 (Cat® Diesel) | On the engine harness, to the Cat® diesel engine harness, near the air intake heater relay | -- | |
C200 (56 cavities) (Cat® Diesel) | In the IP harness, to the engine harness, under the right side of the IP | -- | |
C200 (56 cavities) (Gasoline) | In the IP harness, to the engine harness, under the right side of the IP | -- | |
C200 (56 cavities) (GM Diesel) | In the IP harness, to the engine harness, under the right side of the IP | -- | |
C208 (8 cavities) (GM Diesel) | In the engine harness, to the IP harness, under right center of the IP | -- | |
C212 (23 cavities) (Upfitter Connector) | Under the left side of the IP, by the left kick panel | ||
C215 (2 cavities) (Automatic Transmission) | In the IP harness, to the clutch/ starter interlock switch jumper, near the brake pedal | -- | |
C223 (2 cavities) (ABS-Hydraulic) | In the park brake switch jumper, to the IP harness, in the left kick panel, over the rear park brake lever | -- | |
C232 (3 cavities) (ABS-Hydraulic) | In the IP harness, inline to the ABS-hydraulic brake harness, near the left side of the interior bulkhead | -- | |
C233 (2 cavities) (ABS-Hydraulic)
| In the IP harness, inline to the ABS-hydraulic brake harness, near the left side of the interior bulkhead | -- | |
C234 (7 cavities) (ABS-Hydraulic) | In the IP harness, inline to the ABS-hydraulic brake harness, near the left side of the interior bulkhead | -- | |
C235 (1 cavity) | In the engine harness, between C200 and P100 | -- | |
C400 (1 cavity) (Cat® Diesel) | On the positive battery cable harness leading to the engine harness, near the top of the bell housing | -- | |
C401 (2 cavities) (Cat® Diesel) | On the top of the bellhousing | -- | |
C402 (2 cavities) (Cat® Diesel) | On the positive battery cable harness, to the engine harness, near the battery | -- | |
C404 (3 cavities) (Electric-Operated Shift System) | In two-speed rear axle jumper harness, to the two-speed rear axle harness | -- | |
C407 (2 cavities) (Cat® Diesel) | In the engine harness, to the automatic transmission (A/T) modulator harness, at the right frame rail, near the starter | -- | |
C409 (8 cavities) (Cat® Diesel) | In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing | -- | |
C409 (8 cavities) (Gasoline) | In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing | -- | |
C409 (8 cavities) (GM Diesel) | In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing | -- | |
C412 | In the air brake dryer jumper harness, in-line to the rear chassis and taillamps harness, on the inside right frame rail | -- | |
C412 | In the air brake dryer/ moisture ejector jumper harness, in-line to the rear chassis and taillamps harness, on the inside right frame rail | -- | |
C412 | In the moisture ejector jumper harness, in-line to the rear chassis and taillamps harness, on the inside right frame rail | -- | |
D200 (Charge Indicator Diode) (Cat® Diesel) | In the IP harness, in the main harness, the in-line generator diode, approximately 4 cm (1.6 in) to the left of the data link connector (DLC) breakout | -- | -- |
G100 (Cat® Diesel) | From the starter motor end ground stud (G101) to the right frame rail ground (G100) | -- | -- |
G100 (Gasoline) | From the starter motor side ground stud (G103) to the right frame rail ground (G100) | -- | -- |
G100 (GM Diesel) | From the starter motor side ground stud (G103) to the right frame rail ground (G100) | -- | -- |
G101 (Cat® Diesel) | From the starter motor end ground stud (G101) to the right frame rail ground (G100) | -- | -- |
G101 (GM Diesel w/ Left Fuel Tank and Dual Batteries) | From the negative battery cable at the right frame rail | -- | -- |
G102 (Cat® Diesel) | From the engine harness, to the outside left frame rail behind the left shock | -- | -- |
G102 (Gasoline) | From the engine harness, to the back of the left cylinder head | -- | -- |
G102 (GM Diesel) | From the engine harness, to the right side of the top front of the engine | -- | -- |
G103 (Cat® Diesel and HD Starter w/ Overcrank Protection) | From the starter motor right side ground stud (G103) to the right frame rail ground (G100) | -- | -- |
G103 (Gasoline) | From the starter motor side ground stud (G103) to the right frame rail ground (G100) | -- | -- |
G105 | The body ground strap and the ABS-air harness, from the outboard side of the left frame rail (G105), to the lower left side of the exterior bulkhead (G107) | -- | -- |
G106 (Gasoline) | From the engine harness to the left rear side of the left cylinder head | -- | -- |
G107 | The body ground strap from the lower left side of the exterior bulkhead (G107) to the outboard side of the left frame rail (G105) | -- | -- |
G108 (Hydraulic Brakes) | From the engine harness, to the left side of the power brake (P/B) booster pump housing | -- | -- |
G117 (Cat® Diesel) | The engine harness ground and generator ground strap, at the right side of the engine (G117) to the generator (G119) | -- | -- |
G117 (Gasoline) | The generator ground strap, from the right side of the engine (G117) to the generator (G119) | -- | -- |
G117 (GM Diesel) | The generator ground strap, from the right side of the engine (G117) to the generator (G119) | -- | -- |
G119 (Cat® Diesel) | The generator ground strap, from the right side of the engine (G117) to the generator (G119) | -- | -- |
G119 (Gasoline) | The generator ground strap, from the right side of the engine (G117) to the generator (G119) | -- | -- |
G119 (GM Diesel) | The engine harness and generator ground strap, from the right side of the engine (G117) to the generator (G119) | -- | -- |
G120 (Gasoline) | The ground cable, at the lower left side of the engine (G120), to the left frame rail (G121) | -- | -- |
G121 (Gasoline) | The ground cable, at the left frame rail (G121) to the lower left side of the engine (G120) | -- | -- |
G122 (GM Diesel) | The ground cable, at the right frame rail (G122) to the lower right side of the engine (G123) | -- | -- |
G123 (GM Diesel) | The ground cable, at the right frame rail (G122) to the lower right side of the engine (G123) | -- | -- |
G124 (Cat® Diesel and HD Starter w/ Overcrank Protection) | From the starter solenoid ground stud (G124) to the starter motor end ground stud (G101) | -- | -- |
G207 (ABS-Hydraulic) | Near the left kick panel, at the park brake switch mounting screw, on the right side of the park brake lever bracket | -- | -- |
G208 | From the IP harness, on the top left side of the steering column | -- | -- |
G400 | From the negative battery cable to the right frame rail | -- | -- |
G400 | From the negative battery cable to the left frame rail | -- | -- |
G401 | From the negative battery cable to the right frame rail | -- | -- |
G413 | The battery negative cable extension, at the left frame rail | -- | -- |
G414 | The battery negative cable extension, at the right frame rail | -- | -- |
P100 | On the right side of the bulkhead | -- | -- |
P102 | On the right side of the bulkhead | -- | -- |
P103 | On the left side of the bulkhead | -- | -- |
S105 | In the forward lamps harness, approximately 15 cm (5.9 in) to the headlamp, the right high/ low beam breakout | -- | -- |
S122 | In the engine harness, approximately 36 cm (14.2 in) from the starter solenoid breakout | -- | -- |
S122 (Cat® Diesel) | In the engine harness, approximately 18 cm (7.1 in) from the G401 G402 breakout | -- | -- |
S123 | In the engine harness, approximately 10 cm (3.9 in) from the vacuum tube breakout | -- | -- |
S123 (Cat® Diesel) | In the engine harness, approximately 34 cm (13.4 in) from the ground breakout | -- | -- |
S123 (GM Diesel) | In the engine harness, approximately 20 cm (7.9 in) to the glow plug relay breakout | -- | -- |
S127 | In the engine harness, approximately 4 cm (1.6 in) in the main branch, to the left of the fuel injectors breakout | -- | -- |
S127 (Cat® Diesel) | In the engine harness, approximately 4 cm (1.6 in) forward of the ether injection temperature switch breakout | -- | -- |
S128 | In the engine harness, approximately 5 cm (2.0 in) from the manifold absolute pressure (MAP) sensor breakout | -- | -- |
S128 (Cat® Diesel) | In the engine harness, approximately 4 cm (1.6 in) from the engine coolant temperature (ECT) gauge sensor breakout | -- | -- |
S129 | In the engine harness, approximately 4 cm (1.6 in) toward the fuel injector breakout from the throttle position (TP) sensor breakout | -- | -- |
S129 (GM Diesel) | In the engine harness, approximately 17 cm (6.7 in) to the rear of the glow plug relay breakout | -- | -- |
S131 (GM Diesel) | In the engine harness, approximately 7 cm (2.8 in) from the glow plug relay breakout, toward the power brake booster pump motor | -- | -- |
S133 (GM Diesel) | In the engine harness, approximately 22 cm (8.7 in) to the rear of the power brake booster pump motor breakout
| -- | -- |
S134 (GM Diesel) | In the engine harness, approximately 16 cm (6.3 in) to the rear of the power brake booster pump motor breakout | -- | -- |
S136 (GM Diesel) | In the engine harness, to the rear of the generator, at the Bat terminal fusible link | -- | -- |
S138 | In the engine harness, approximately 4 cm (1.6 in) from the generator harness breakout | -- | -- |
S138 (Cat® Diesel) | In the engine harness, approximately 11 cm (4.3 in) from the main harness, toward the forward lamps harness connector | -- | -- |
S138 (GM Diesel) | In the engine harness, approximately 20 cm (7.9 in) toward the forward lamps harness connector from the fuel tank harness | -- | -- |
S140 | In the engine harness, approximately 4 cm (1.6 in) toward the knock sensor (KS), from the engine speed governor breakout | -- | -- |
S140 (GM Diesel) | In the engine harness, approximately 9 cm (3.5 in) toward the transmission harness breakout, from the ABS harness breakout | -- | -- |
S141 | In the engine harness, approximately 17 cm (6.7 in) throttle position (TP), from generator harness breakout | -- | -- |
S142 (Gasoline) | In the engine harness, approximately 4 cm (1.6 in) from the throttle position (TP) sensor, toward the breakout | -- | -- |
S142 (Cat® Diesel) | In the engine harness, approximately 4 cm (1.6 in) | -- | -- |
S142 (GM Diesel) | In the engine harness, approximately 11 cm (4.3 in) from the power brake booster pump motor breakout, toward the brake fluid switches | -- | -- |
S146 | In the ABS-air chassis harness, approximately 94 cm (37.0 in) from the electronic brake control module (EBCM) | -- | -- |
S146 (GM Diesel) | In the radiator shutter jumper harness, approximately 45 cm (17.7 in) from the radiator shutter | -- | -- |
S168 (GM Diesel) | In the GM diesel engine harness, approximately 2 cm (0.8 in) from the electronic noise filter extension harness, toward the glow plug relay | -- | -- |
S169 (Cat® Diesel) | In the engine harness, approximately 4 cm (1.6 in) before from the first breakout toward P100 and P103 | -- | -- |
S170 | In the ABS-air brake harness, approximately 28 cm (11 in) from electronic brake control module (EBCM) | -- | -- |
S182 | In the engine harness, approximately 4 cm (1.6 in) from the generator breakout | -- | -- |
S182 (Cat® Diesel) | In the engine harness, approximately 16 cm (6.3 in) from generator terminal C1 | -- | -- |
S201 | In the IP harness, approximately 35 cm (13.8 in) from C200 | -- | -- |
S203 | In the IP harness, approximately 4 cm (1.6 in) from the IP fuse block breakout | -- | -- |
S203 (Cat® Diesel) | In the IP harness, approximately 4 cm (1.6 in) from the IP fuse block breakout | -- | -- |
S203 (GM Diesel) | In the IP harness, approximately 22 cm (8.7 in) to the right of the data link connector (DLC) breakout | -- | -- |
S204 (Cat® Diesel) | In the IP harness, approximately 4 cm (1.6 in) to the left of the IP fuse block breakout | -- | -- |
S205 (GM Diesel) | In the IP harness, approximately 4 cm (1.6 in) to the left of the IP fuse block breakout | -- | -- |
S206 | In the IP harness, approximately 14 cm (5.5 in) to the right of the hazard warning switch breakout | -- | -- |
S207 | In the IP harness, approximately 14 cm (5.5 in) to the right of the hazard warning switch breakout | -- | -- |
S208 | In the IP harness, approximately 9 cm (3.5 in) to the right of the hazard warning switch breakout | -- | -- |
S209 | In the IP harness, approximately 7 cm (2.8 in) to the right of the hazard warning switch breakout | -- | -- |
S210 | In the IP harness, approximately 4 cm (1.6 in) to the right of the hazard warning switch breakout | -- | -- |
S212 | In the IP harness, approximately 7 cm (2.6 in) to the left of the hazard warning switch breakout | -- | -- |
S214 | In the IP harness, approximately 25 cm (9.8 in) to the right of the data link connector (DLC) breakout | -- | -- |
S218 | In the IP harness, approximately 17 cm (6.7 in) to the right of the data link connector (DLC) breakout | -- | -- |
S219 | In the IP harness, approximately 17 cm (6.7 in) to the right of the data link connector (DLC) breakout | -- | -- |
S220 | In the IP harness, approximately 15 cm (5.9 in) to the right of the data link connector (DLC) breakout | -- | -- |
S221 | In the IP harness, approximately 12 cm (4.7 in) to the right of the data link connector (DLC) breakout | -- | -- |
S222 | In the IP harness, approximately 11 cm (4.3 in) to the right of the data link connector (DLC) breakout | -- | -- |
S225 (Cat® Diesel) | In the IP harness, at the anode (+) end of the charge indicator diode (D200), approximately 4 cm (1.6 in) to the right of the data link connector (DLC) breakout | -- | -- |
S226 (Cat® Diesel) | In the IP harness, at the cathode (-) end of the charge indicator diode (D200), approximately 10 cm (3.9 in) to the right of the data link connector (DLC) breakout | -- | -- |
S227 | In the IP harness, approximately 57 cm (22.4 in) from the headlamps dimmer switch breakout | -- | -- |
S230 | In the IP harness, approximately 4 cm (1.6 in) to the right of the instrument panel cluster (IPC) connector breakout | -- | -- |
S231 | In the IP harness, approximately 66 cm (26.0 in) from the main harness, toward the IP harness connector | -- | -- |
S232 | In the IP harness, approximately 59 cm (23.2 in) from the main harness, toward the IP harness connector | -- | -- |
S233 | In the IP harness, approximately 9 cm (3.5 in) to the right of the daytime running lights (DRL) module breakout | -- | -- |
S237 | In the engine harness, approximately 15 cm (5.9 in) from the interior side of P102 | -- | -- |
S239 (GM Diesel) | In the engine harness, approximately 39 cm (15.4 in) from the interior side of P102 | -- | -- |
S241 (Cat® Diesel) | In the engine harness, at the cathode (-) end of the ether injection diode (D101), approximately 11 cm (4.3 in) from the ether injection control valve breakout | -- | -- |
S242 (GM Diesel) | In the IP harness, approximately 4 cm (1.6 in) from the MaxiFuse® block/ mini-relay center | -- | -- |
S261 (ABS-Hydraulic) | In the ABS-hydraulic jumper harness, approximately 40 cm (15.7 in) from the exterior bulkhead pass-through P103 | -- | -- |
S405 | In the fuel tank harness, approximately 196 cm (77.1 in) to the rear of the fuel harness connector | -- | -- |
S406 | In the two-speed rear axle harness, approximately 65 cm (25.6 in) forward of the two-speed rear axle shift relay breakout | -- | -- |
S407 | In the fuel tank harness, approximately 13 cm (5.1 in) forward of the fuel pump breakout | -- | -- |
S408 | In the fuel tank harness, approximately 7 cm (2.8 in) forward of the fuel pump breakout | -- | -- |
S418 (Two-Speed Rear Axle) | In the two-speed rear axle harness, approximately 65 cm (25.6 in) forward of the two-speed rear axle shift relay breakout | -- | -- |
