Name | Location | Locator View | Connector End View |
|---|---|---|---|
Accelerator Pedal (AP) | To the left of center, on the lower bulkhead | ||
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 | -- | |
Automatic Engine Shutdown/ Engine Coolant Temperature (ECT) Switch (Cat® Diesel) | On the right side of the engine, on the left rear side of the coolant outlet housing | ||
Automatic Transmission (AT) Modulator (Cat® Diesel) | On the lower left side of the transmission | -- | |
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 | ||
Battery | On the top of the crossmember or relocated by the upfitter | -- | |
Clutch Pedal Position (CPP) Switch (Cat® Diesel) | On the clutch pedal bracket | ||
Cruise Control Switch | On the left side of the steering column | ||
Cruise Control Switch | On the left side of the steering column | ||
Data Link Connector (DLC) (Cat® Diesel) | Right of steering column cover | Data Link Communications Component Views | |
Data Link Connector (DLC) (Cat® Diesel) | Right of steering column cover | -- | |
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 | ||
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 | On the left side of the IP, part of the instrument panel cluster (IPC) | -- | |
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) Switch (Cat® Diesel) | On the right side of the engine, to the rear of the coolant outlet | ||
Engine Exhaust (EE) Brake/ Air Interlock Relay | In the flasher/ relay center, position 2-B | ||
Engine Exhaust (EE) Brake Solenoid Valve | On the left rear side of the back-of-the-cab crossmember | ||
Engine Exhaust (EE) Brake Switch | On the center of the IP | ||
Engine Oil Pressure (EOP) Gauge | On the left side of the IP, part of the instrument panel cluster (IPC) | -- | |
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) Indicator Switch (Automatic Engine Shutdown) (Cat® Diesel) | On the left side of the engine block, on a tee fitting pointing to the rear | ||
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) harness | -- | |
Fusible Link N (rust) (Diesels) | In the engine harness, to the generator B+ stud | -- | -- |
Fusible Link R (gray) (ABS-Hydraulic) | On the positive battery cable end | -- | -- |
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 | ||
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 | -- | |
IP Fuse Block | In the center of the IP, to the left of the instrument panel cluster (IPC) | -- | |
Instrument Panel Cluster (IPC) | In the left side of the IP | ||
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 | ||
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) 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. | ||
Multifunction Switch | On the left side of the steering wheel (contains the turn signal, windshield wiper, and windshield washer switches and controls the headlamps dimmer switch) | ||
Powertrain Control Module (PCM) (Cat® Diesel) | On the left rear side of the engine block | -- | |
Speedo Adapter | Under the right side of the IP | -- | |
Speedometer | On the left side of the IP, part of the instrument panel cluster (IPC) | -- | |
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 | -- | |
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 | -- | |
Upfitter Connector (C212, 23 cavities) | Under the left side of the IP, by the left kick panel | ||
Vehicle Speed Sensor (VSS) | On the lower left side of the transmission tailshaft housing | -- | |
Vehicle Speed Sensor (VSS) (Cat® Diesel) | On the lower left side of the transmission tailshaft housing | -- | |
C107 (7 cavities) (ABS-Air) | In the IP harness, to the chassis jumper harness (ABS-Air), approximately 33 cm (13 in) from P100 | -- | |
C112 (2 cavities) (Cat® Diesel) | In the engine harness, to the engine exhaust brake harness, near the frame rail, by the starter | -- | |
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 | -- | |
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 | -- | |
C202 (6 cavities) (Cat® Diesel) | In the IP harness, to the IP-to-chassis jumper harness (ABS-air), under the IP, on the right side of the steering column | -- | |
C217 (8 cavities) (Cat® Diesel) | In the IP harness, to the engine harness, near the right side of the interior bulkhead | -- | |
C227 (2 cavities) (Automatic Transmission) | In the IP harness, to the clutch pedal position (CPP) switch shunt, near the brake pedal | -- | |
C227 (2 cavities) (Manual Transmission) | In the IP harness, to the clutch pedal position (CPP) switch jumper, near the brake pedal | -- | |
C234 (7 cavities) (ABS-Hydraulic) | In the IP harness, inline to the ABS-hydraulic brake harness, near the left side of the interior bulkhead | -- | |
C400 (1 cavity) (Cat® Diesel) | On the positive battery cable harness, to the engine harness, near the battery. | -- | |
C401 (2 cavities) (Cat® Diesel) | On the positive battery cable harness, to the engine harness, near the battery | -- | |
C402 (2 cavities) (Cat® Diesel) | On the positive battery cable harness, to the engine harness, near the battery | -- | |
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 | -- | |
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 | -- | -- |
G101 (Cat® Diesel) | From the starter motor end ground stud (G101) to the right frame rail ground (G100) | -- | -- |
G102 (Cat® Diesel) | From the engine harness, to the lower right front side of the engine | -- | -- |
P100 | On the right side of the bulkhead | -- | -- |
P103 | On the left side of the bulkhead | -- | -- |
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 | -- | -- |
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 | -- | -- |
S142 (Cat® Diesel) | In the engine harness, approximately 4 cm (1.6 in) | -- | -- |
S169 (Cat® Diesel) | In the engine harness, approximately 4 cm (1.6 in) before from the first breakout toward P100 and P103 | -- | -- |
S182 (Cat® Diesel) | In the engine harness, approximately 16 cm (6.3 in) from generator terminal C1 | -- | -- |
S203 (GM Diesel) | In the IP harness, approximately 22 cm (8.7 in) to the right of the data link connector (DLC) breakout | -- | -- |
S210 | In the IP harness, approximately 4 cm (1.6 in) to the right 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 | -- | -- |
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 | -- | -- |
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 | -- | -- |
S234 | In the IP harness, approximately 4 cm (1.6 in) to the right of the daytime running lights (DRL) module breakout | -- | -- |
S247 (Cat® Diesel) | In the IP harness, approximately 15 cm (5.9 in) to the left of the multifunction alarm module (MFAM) breakout | -- | -- |
S248 (Cat® Diesel) | In the IP harness, approximately 12 cm (4.7 in) to the left of the multifunction alarm module (MFAM) breakout | -- | -- |
S249 (Cat® Diesel) | In the IP harness, approximately 20 cm (7.9 in) to the left of the multifunction alarm module (MFAM) breakout | -- | -- |
S250 (Cat® Diesel and ABS-Air Brakes) | In the IP harness, approximately 16 cm (6.3 in) from the exhaust brake/ air interlock relay connector, by the MaxiFuse® block/ mini-relay center | -- | -- |
S252 (Cat® Diesel) | In the IP harness, approximately 9 cm (3.5 3.5 in) from MaxiFuse® block 1, toward the flasher/ relay center | -- | -- |
S404 | In the positive battery cable connector, at the end of the gray fusible link R | -- | -- |
