Model Condition Price Qty  
MD19181 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
1980 Truck Wiring Diagrams Supplement MD19181
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Covers medium duty Chevrolet and GMC conventional truck models C6, C60, C6000, C7, C70, & C7000 with GM 8.2L or Caterpillar 3208 diesel engine. For C6, C60, & C6000 with 4-53 diesel engine, or gas engines see my other items. To verify that this is the correct diagram for your truck, you can check your VIN code. The 4th digit should be a D for the medium duty conventional cab, the 5th digit should be an F or a G to indicate the 8.2 diesel (or a Y to indicate the 3208), and the 6th digit should be an A to indicate the 1980 model year.
1980 Chevrolet C60 C6D042
1980 Chevrolet C60 C6D062
1980 Chevrolet C70 C7D042
1980 Chevrolet C70 C7D064
1980 GMC C6000 C6D042
1980 GMC C6000 C6D062
1980 GMC C7000 C7D042
1980 GMC C7000 C7D064
1980 Chevrolet C60 1980 Chevrolet C70 1980 GMC C6000 1980 GMC C7000