Condition Price Qty  
Very Good $29.00
This is the original wiring diagram printed by GMC 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 - CE/CS-4500-5500(02); CE-6500(02) MD-8417"
1
Included
This item is original.
11.00 x 8.50 x 0.10 inches
MD8417
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Covers 1972 medium duty GMC truck models C4500, C5500, and C6500 sold with just a cowl and not a full cab. See my other items for the cab wiring diagram. To verify that this is the correct diagram for your truck, you can check your VIN code. The 2nd digit should be a C for the medium duty conventional cab, the 4th digit should be a 4, 5 or a 6 for the 4500-6500 series, the 5th digit should be 2 to indicate the cowl model, and the 6th digit should be a 2 to indicate 1972.
1972 GMC Series 4500-6500
1972 GMC Series 4500-6500