Model Condition Price Qty  
MD17845 Very Good $19.00
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.
General Motors
1979 Truck Wiring Diagrams MD 17845
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Covers the General and Bison, also known as N9 with Cummins diesel. To verify that this is the correct diagram for your truck, you can check your VIN code. The 4th digit should be either an E or an F for the aluminum conventional cab, the 5th digit should be a C for the Cummins NTC or Formula 290, 350, or 400, and the 6th digit should be a 9 to indicate the 1979 model year.
1979 Chevrolet Bison
1979 GMC General
1979 Chevrolet Bison 1979 GMC General