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 - DC/FC-9003; DC/FC-9502 - MD-11837"
This item is original.
11.00 x 8.50 x 0.10 inches
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Covers GMC Astro 95 and Chevrolet Titan 90, also known as D9 with NTC 290 Cummins Diesel engine. To verify that this is the correct diagram for your truck, you can check your VIN code. The 2nd digit should be either a D or an F for heavy duty aluminum tilt cab. The 3rd digit should be a C to indicate the Cummins NTC 290 Diesel, and the 6th digit should be an 5 for the 1975 model year.

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 Titan 90
1975 GMC Astro 95
1975 Chevrolet Titan 90 1975 GMC Astro 95