Electrical Center Identification Views. Chevrolet Chevrolet C-Series Medium Duty Truck B7 1998

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1998 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Electrical Center Identification Views

Table 1:	Fuse Block Fuse Applications
Table 2:	MaxiFuse® Block 1 Fuse Applications
Table 3:	MaxiFuse® Block 2 Fuse Applications
Table 4:	Diode, Fusible Link and In-line Fuse Applications

IP Fuse Block

Fuse Block Fuse Applications

Circuit Breaker

Rating

Description

IGN 1 Circuit Breaker

10A

Automatic Transmission (A/T) Selector Control, Clutch Pedal Position (CPP) Switch, Daytime Running Lights (DRL) Control Module, DRL Relay (Coil),

Driver Information Center (DIC):

•	ABS Indicator

•	DRL Indicator

•	ENGINE OVER SPEED Indicator (Gasoline)

•	HIGH IDLE Indicator (Diesels)

•	INTAKE HEATER Indicator (Cat® Diesel)

•	LOW AIR Indicator

•	LOW COOLANT Indicator

•	Park Brake Indicator

•	PRIMARY BRAKE Indicator

•	SERVICE THROTTLE SOON Indicator (GM Diesel)

•	WATER IN FUEL Indicator (GM Diesel)

Generator (Cat® Diesel), Generator Diode (D200) (Cat® Diesel), Engine Hour Meter, Ignition 1 Relay (Coil), Ignition Coil, Instrument Panel Cluster (IPC):

•	CHECK GAGES Indicator

•	Check Gauges Logic

•	Engine Coolant Temperature (ECT) Gauge

•	Engine Oil Pressure (EOP) Gauge

•	Fuel Gauge

•	Generator Charge Indicator

•	Speedometer

•	Tachometer

•

Voltmeter

Multifunction Alarm, Powertrain Control Module (PCM)

Radiator Shutter Relay (GM Diesel) (Coil and Load): Radiator Shutter Control Valve

Speedo Adapter, Stoplamps Switch Interface Module

STOP LP Circuit Breaker

20A

Stoplamps Switch (Connector C1)

HORNS Circuit Breaker

20A

Data Link Connector (DLC)

Horn Relay (Coil and Load): Horns

ENG Circuit Breaker

(Cat® Diesel)

20A

Ignition 1 Relay (Load):

•	Radiator Shutter Control Valve

•	Air Intake Heater (Connector C127)

ENG Circuit Breaker (Gasoline)

20A

Ignition 1 Relay (Load)

•	Engine Speed Governor Module

•	Exhaust Gas Recirculation (EGR) Electronic Vacuum Regulator Solenoid Valve

•	Knock Sensor (KS) Module

•	Throttle Body Fuel Injector 1

•	Throttle Body Fuel Injector 2

ENG Circuit Breaker (GM Diesel)

20A

Ignition 1 Relay (Load):

•	Automatic Transmission (A/T) Modulator Relay (Coil and Load): Automatic Transmission (A/T) Modulator

•	Engine Shutoff Solenoid

•	Fuel Solenoid Driver

•	Powertrain Control Module (PCM)

ECM Circuit Breaker

(Cat® Diesel)

30A

Powertrain Control Module (PCM)

ECM Circuit Breaker

(Gasoline and GM Diesel)

15A

Powertrain Control Module (PCM)

FUEL Circuit Breaker

(Cat® Diesel)

20A

Ether Injection Control Valve Relay (Load):

•	Ether Injection Control Valve

•	Ether Injection Control Valve Diode (D101)

FUEL Circuit Breaker

(Gasoline)

20A

Fuel Pump (FP) Relay (Load):

•	Engine Oil Pressure (EOP) Sensor and FP Switch,

•	Fuel Sender and FP

•	Powertrain Control Module (PCM)

FUEL Circuit Breaker

(GM Diesel)

20A

Fuel Pump (FP) Relay (Load):

•	Engine Oil Pressure (EOP) Sensor and FP Switch

•	Glow Plug Relay

•	Turbocharger Wastegate Regulating Solenoid Valve

TL/MKR Circuit Breaker

20A

Lighting Relay (Load):

•	Front Park and Turn Signal Lamps

•	Upfitter Connector (Terminal A)

PNL Circuit Breaker

10A

Headlamps Switch:

•	IP Lamps Dimmer Control to Upfitter Connector (Terminal F)

•	Lighting Relay (Coil)

HAZ Circuit Breaker

20A

Turn/Hazard Flasher:

•	Front Turn Signal Lamps

•	Hazard Lamps

•	Upfitter Connector (Terminal Z and L)

CHASSIS Circuit Breaker

(Cat® Diesel and Gasoline)

20A

Air Brake Dryer, Heated Moisture Ejector Valve

CHASSIS Circuit Breaker

(GM Diesel)

20A

Fuel Filter Heaters, Powertrain Control Module (PCM), Water in Fuel Sensors

IGN 3 Circuit Breaker

10A

ABS Indicator Relay (Coil) (ABS-Hydraulic), ABS Relay (Coil), Automatic Transmission (A/T) Oil Temperature Gauge, AUX Relay (Coil), Electronic Brake Control Module (EBCM) (ABS-Hydraulic), EXHAUST BRAKE Switch, Generator (Gasoline), FAST IDLE Switch, Ignition 3 Relay (Coil), Upfitter Connector (Terminal V)

B/U Circuit Breaker

10A

Backup Lamps Switch: Upfitter Connector (Terminal K)

AUX 2 Circuit Breaker

20A

Two-Speed Rear Axle Air Shift Switch (Air-Operated): Speedo Adapter.

Two-Speed Rear Axle Shift Relay (Coil and Load) (Electric-Operated):

•	Two-Speed Rear Axle Shift Motor

•	Two-Speed Rear Axle Shift Switch

Speedo Adapter

ACC Circuit Breaker

10A

Upfitter Connector (Terminal R)

BRK 1 Circuit Breaker

ABS--Hydraulic

10A

Stoplamps Switch (Connector C1):

•	Power Brake (P/B) Booster Pump Motor Relay (Coil)

•	Multifunction Alarm

BRK 2 Circuit Breaker

10A

Multifunction Alarm

AUX 1 Circuit Breaker

(Cat® Diesel)

15A

Fuel Heater

START Circuit Breaker

(Gasoline and GM Diesel)

10A

Clutch/Starter Interlock Switch or Shunt to Upfitter Connector (Terminal D), Multifunction Alarm, Neutral Switch, Powertrain Control Module (PCM), Starter Relay (Coil)

START Circuit Breaker

(Cat® Diesel)

10A

Clutch/Starter Interlock Switch or Shunt to Upfitter Connector (Terminal D), Ether Injection Switch, Multifunction Alarm, Neutral Switch, Starter Relay (Coil), Starter Thermal Switch (HD Starter and Overcrank Protection)

MaxiFuse® Block 1 Fuse Applications

Fuse

Rating

Description

HORN/STOP MaxiFuse®

30A

Generator

HORNS Circuit Breaker

STOP LP Circuit Breaker

HD LP SW MaxiFuse®

30A

Headlamps Switch

IGN SW 1 MaxiFuse®

(Cat® Diesel and Gasoline)

30A

Ignition Switch (Connector C1):

•	ACC Circuit Breaker

•	IGN 1 Circuit Breaker

•	START Circuit Breaker

IGN SW 1 MaxiFuse®

(GM Diesel)

30A

Ignition Switch (Connector C1):

•	ACC Circuit Breaker

•	IGN 1 Circuit Breaker

•	START Circuit Breaker

•	FUEL Circuit Breaker

ENG MaxiFuse®

(Cat® Diesel and Gasoline)

50A

ECM Circuit Breaker

ENG Circuit Breaker

FUEL Circuit Breaker

ENG MaxiFuse®

(GM Diesel)

50A

ECM Circuit Breaker

ENG Circuit Breaker

AUX MaxiFuse®

40A

AUX Relay (Load)

BODY POWER 1 MaxiFuse®

50A

Upfitter IP (B+) Junction Box

(BODY POWER 2 MaxiFuse® also supplies power for this load)

MaxiFuse® Block 2 Fuse Applications

Fuse

Rating

Description

LIGHTING MaxiFuse®

40A

HAZ Circuit Breaker

PNL Circuit Breaker

TL/MKR Circuit Breaker

STARTER MaxiFuse®

50A

Starter Relay (Load)

IGN SW 2 MaxiFuse®

30A

Ignition Switch (Connector C2):

•	B/U Circuit Breaker

•	CHASSIS Circuit Breaker

•	IGN 3 Circuit Breaker

ABS MaxiFuse®

(ABS--Air)

30A

ABS Relay (Load):

Electronic Brake Control Module (EBCM)

ABS MaxiFuse®

(ABS--Hydraulic)

60A

Electronic Brake Control Module (EBCM)

Not Used

BODY POWER 2 MaxiFuse®

50A

Upfitter IP (B+) Junction Box

(BODY POWER 1 MaxiFuse® also supplies power for this load)

Diode, Fusible Link and In-line Fuse Applications

Fuse/Circuit Breaker

Rating

Description

D100

(A/C Compressor Clutch Diode)

1.0A

@ 25°C, 400 PIV, Axial

D101

(Ether Injector Diode)

(Cat® Diesel)

1.0A

@ 25°C, 400 PIV, Axial

D103

(ABS Indicator Diode)

1.0A

@ 23°C, 400 PIV, 280 MINI

(GM part number 12135037)

D200

(Generator Diode)

(Cat® Diesel)

1.0A

@ 25°C, 400 PIV, Axial

Fusible Link A

(GM Diesel)

2 mm (14 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Glow Plug Relay, Terminal C2, to Splice S151 and Glow Plugs 2, 4, 6 and 8

Fusible Link B

(GM Diesel)

2 mm (14 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Glow Plug Relay, Terminal C2, to Splice S152 and Glow Plugs 1, 3, 5, 7 and Fusible Link C to In-line Connector C100 (2 Cavities)

Fusible Link C

(GM Diesel)

0.35 mm (22 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Splice S153 to In-line Connector C100 (2 Cavities) WAIT Indicator and Powertrain Control Module (PCM)

Fusible Link D

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Splice S156 to Glow Plug 7

Fusible Link E

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Splice S156 to Glow Plug 5

Fusible Link F

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Splice S161 to Glow Plug 8

Fusible Link G

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Splice S161 to Glow Plug 6

Fusible Link H

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Splice S160 to Glow Plug 4

Fusible Link J

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Splice S155 to Glow Plug 1

Fusible Link K

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Splice S155 to Glow Plug 3

Fusible Link L

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Glow Plug Harness, from Splice S160 to Glow Plug 2

Fusible Link N

(GM Diesel)

5 mm (10 GAGE)

16.1 cm (6.3 in)

long

In Engine Harness, between Generator Terminal C2 and Splice S182, to Glow Plug Relay Terminal C1 (GM Diesel)

Fusible Link N

(Cat® Diesel)

5 mm (10 GAGE)

16.1 cm (6.3 in)

long

In Engine Harness, between Generator Terminal C2 and Splice S132, to Air Intake Heater (Cat® Diesel)

Fusible Link P

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Engine Harness, between Starter Solenoid Terminal C2 and Splice S121, to Ammeter

Fusible Link R

(ABS--Hydraulic)

2 mm (14 GAGE)

16.1 cm (6.3 in)

long

In Positive Battery Cable, between Battery and Splice S404, to IP Fuse Block BRK Circuit Breaker and Power Brake (P/B) Booster Pump Motor Relay , Terminal 30

Fusible Link S

(GM Diesel)

0.8 mm (18 GAGE)

16.1 cm (6.3 in)

long

In Engine Harness, between Splice S122 and S123, to Ammeter

Generator In-line Fuse

10A

Engine Hour Meter, Multifunction Alarm and Tachometer (Diesels)