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.
"Cab, Engine and Chassis Wiring TE-5500-6500; TM 5500-7500; TS 5500 MD-6427"
This item is original.
8.50 x 11.00 x 0.10 inches
Covers heavy duty GMC truck models with gasoline engines, also known as TE 5500-6500, TM 5500-7500, & TS 5500.
1970 GMC Series 4500-6500
1970 GMC Series 7500-9500
1970 GMC Series 4500-6500 1970 GMC Series 7500-9500