Model Condition Price Qty  
MD12748 Very Good $29.00
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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
"Cab, Engine and Chassis Wiring - CE/CS-5003; CE/CS-60003; CE-60013; CE/ME-65003-65013 - MD-12748"
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Covers mid 1975 medium duty Chevrolet and GMC conventional truck models C5, C50, C5000, C6, C60, & C6000. 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 5 or a 6 for the 50 or 60 series, the 5th digit should be 3 to indicate the chassis cab model, and the 6th digit should be a 5 to indicate 1975.

To find out if yours is a mid-year model (built after March 1, 1975), check the last six digits of the VIN, which should be larger than 590000 for GMC or larger than 140000 for Chevrolet. See the 1974-1975 diagram if the last six digits are smaller.
1975 Chevrolet 40-60 Medium Duty
1975 GMC Series 4500-6500
1975 Chevrolet 40-60 Medium Duty 1975 GMC Series 4500-6500

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