GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Battery, Inside

On the outboard side of the right frame rail

Power and Grounding Component Views in Wiring Systems

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Battery, Outside

On the outboard side of the right frame rail

Power and Grounding Component Views in Wiring Systems

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Fusible Link

In the engine harness to starter solenoid C2

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Generator

On the right side of the engine

Engine Electrical Component Views

Engine Electrical Connector End Views

Generator Inline Fuse

Taped to the engine harness, at the rear of the generator

Engine Electrical Component Views

Engine Electrical Connector End Views

Ground Block (6 cavities)

On the right frame, inboard, part of the negative battery cable

Power and Grounding Component Views in Wiring Systems

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Hourmeter

Under the left side of the IP near the data link connector (DLC)

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Ignition Switch

On the right side of the steering column

Lighting Systems Component Views in Lighting Systems

Power and Grounding Connector End Views in Wiring Systems

Instrument Panel Cluster (IPC)

On the left side of the IP

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Instrument Panel Cluster (IPC) C1 (15 cavities)

In the upper IP harness to the IPC

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Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Instrument Panel Cluster (IPC) C2 (9 cavities)

In the upper IP harness to the IPC

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Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Instrument Panel Cluster (IPC) C3 (17 cavities)

In the upper IP harness to the IPC

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Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Instrument Panel Cluster (IPC) C4 (7 cavities)

In the upper IP harness to the IPC

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Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Instrument Panel Cluster (IPC) C5 (13 cavities)

In the upper IP harness to the IPC

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Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

IP Fuse Block

In the right top of the IP, under the access panel

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

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Multifunction Alarm Module (MFAM) (Air Brakes)

Under the right seat

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

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Multifunction Alarm Module (MFAM) (Air Brakes) C1 (16 cavities)

In the lower IP harness to the MFAM

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Audible Warnings Connector End Views in Instrument Panel, Gauges, and Console

Multifunction Alarm Module (MFAM) (w/ Automatic Engine Shutdown) C2 (4 cavities)

In the lower IP harness to the MFAM

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Audible Warnings Connector End Views in Instrument Panel, Gauges, and Console

Multifunction Alarm Module (MFAM) (Hydraulic Brakes)

Under the right seat

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

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Multifunction Alarm Module (MFAM) (Hydraulic Brakes) C1 (16 cavities)

In the lower IP harness to the MFAM

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Audible Warnings Connector End Views in Instrument Panel, Gauges, and Console

Neutral Position Switch (Automatic Transmission)

On the lower left side of the transmission

Engine Electrical Component Views

Engine Electrical Connector End Views

Negative Battery Cable

From the outboard battery NEG terminal to the outside right frame rail with a feed to the ground block on the inside of the right frame rail

Power and Grounding Component Views in Wiring Systems

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Negative Battery to Battery Cable

From the outboard battery NEG terminal to the inboard battery NEG terminal

Power and Grounding Component Views in Wiring Systems

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Positive Battery Cable

From the positive battery cable POS terminal to the starter solenoid, at the starter motor

Power and Grounding Component Views in Wiring Systems

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Positive Battery Cable (Dual Batteries)

From the outboard battery POS terminal to the starter solenoid

Power and Grounding Component Views in Wiring Systems

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Positive Battery to Battery/Feed Cable

From the outboard battery POS terminal to the inboard battery POS terminal with a feed to the MaxiFuse® block

Power and Grounding Component Views in Wiring Systems

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Starter Motor

On the lower right side of the engine

Engine Electrical Component Views

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Starter Relay

On the right frame rail at the right engine mount bracket

Engine Electrical Component Views

Engine Electrical Connector End Views

Starter Solenoid

On the lower right side of the engine, part of the starter motor assembly

Engine Electrical Component Views

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Starter Motor Ground Cable

On the lower right side of the engine from the starter to the right frame rail

Engine Electrical Component Views

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C116 (8 cavities)

In the engine harness, to the front chassis harness, at the right front of the engine

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C121 (2 cavities)

In the starter harness, to the BLU and the BLK fusible links, starter solenoid C3

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200 (56 cavities)

In the lower IP harness, to the front chassis harness, in the left center of the cab, in the cab interface connector

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C212 (84 cavities)

In the lower IP harness, to the upper IP harness, in the left center of the IP at the floor

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Inline Harness Connector End Views in Wiring Systems

C412 (8 cavities) (Automatic Transmission)

In the front chassis harness, to the transmission harness or connector C412 jumper, behind the engine, at the top of the bell housing

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C419 (1 cavity) (Automatic Transmission)

In the starter harness, to the front chassis harness, on the bell housing mounting bracket

Harness Routing Views in Wiring Systems

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C419 (1 cavity) (Manual Transmission)

In the starter harness, to the front chassis harness, on the bell housing mounting bracket

Harness Routing Views in Wiring Systems

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G107

From the front chassis harness, on the left frame rail, approximately 25 cm (9.8 in) to the rear of the front shock absorber

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G400

The negative battery cable to the right frame rail

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P100

On the front chassis harness, under the hood, in the center of the bulkhead, in the cab interface connector housing

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S103

In the front chassis harness, approximately 7 cm (2.8 in) to the rear of the main harness breakout

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S107

In the front chassis harness, approximately 4 cm (1.6 in) to the ABS harness breakout

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S182

In the front chassis harness, approximately 13 cm (5.1 in) to the rear of the engine oil pressure switch breakout

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S227

In the upper IP harness, under the IP, approximately 6 cm (2.4 in) to the left of the fuse block breakout

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S254

In the lower IP harness

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S279

In the lower IP harness, below the IP, approximately 5 cm (2.0 in) to the right of the relay center 1 harness breakout

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S292

In the lower IP harness, in the main harness, at the frame harness breakout

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