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 - CE/CS-50002; 60002 MD-10798" & MD10797
This item is original.
11.00 x 8.50 x 0.10 inches
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Covers 1974 and early 1975 medium duty Chevrolet and GMC conventional truck models C5, C50, C5000, C6, C60, & C6000. For a truck with the GM cowl instead of a full cab see my other items. 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, 5th digit might be a 1 or a 3 to indicate the chassis cab model (GM's info is a bit unclear on this, but it probably should not be a 2, which would indicate the cowl model), and the 6th digit should be a 4 or 5 to indicate 1974 or 1975.

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