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This is the original wiring diagram printed by GM for dealer mechanics. You can follow the wiring in your truck from bumper-to-bumper. It will help you to understand connector configurations, and locate & identify circuits, relays, and grounds. Although the schematic is in black and white, the color of each wire is noted. You will not find this diagram in your shop manual. The schematic measures 8.5" x 11" when folded up, and opens up to 11" by 38". The diagram pictured is an example of this type when folded, but is not the actual diagram for your vehicle. Buy now for the best electrical repair info - the factory wiring diagram.


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Exact Title: Wiring Diagrams Medium/Heavy Duty Truck 1981 GM Trucks Brigadier
Page Count: 1
Wiring Diagrams?: Included
Authenticity: This item is original.
Dimensions: 11.00 x 8.50 x 0.10
OEM Part Number: MD19429

Model-Years Application

Covers Brigadier, also known as the J8 or J9 models, both gasoline and diesel. To verify that this is the correct diagram for your truck, you can check your VIN code. The 6th digit should be a C for the heavy duty steel conventional cab, and the 10th digit should be a B to indicate the 1981 model year.
1981 GMC Brigadier


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