Condition Price Qty  
Very Good $29.00
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.
"Cab, Engine and Chassis Wiring - HM-8721B MD-7917"
This item is original.
11.00 x 8.50 x 0.10 inches
MD7917 1972
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This book covers 1972 GMC 8700 Conventional models with a gasoline engine. See my other items for the diesel diagrams. To verify that this is the correct diagram for your truck, you can check your VIN code. The 2nd digit should be an H for the 92" conventional cab, the 3rd digit should be an M for the gas engine, the 4th digit should be an 8 for the 8000 series, and the 6th digit should be an O for the 1972 model year.
1972 GMC Series 7500-9500
1972 GMC Series 7500-9500