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Description 

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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Specifications

Exact Title: "Cab, Engine and Chassis Wiring - HJ/JJ/HV/JV-7500(13)" MD-7738 MD-7739
Page Count: 1
Wiring Diagrams?: Included
Authenticity: This item is original.
Dimensions: 11.00 x 8.50 x 0.10
OEM Part Number: MD7739 1971

Model-Years Application

This diagram covers 1971 GMC 7500 Conventional models equipped with diesel engines. See my other items for gas engines. To verify that this is the correct diagram for your truck, you can check your VIN code. The 1st digit should be an H or a J for the heavy duty steel conventional cab, the 2nd digit should be a V for the 6V-53 Detroit Diesel engine or a J for the DHC637 GMC diesel, and the last six digits should be between 170001 and 500000 to indicate the 1971 model year.
1971 GMC Series 7500-9500

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