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.
"Forward Control Chasssis Wiring - P-10, 20, 30 A-2261"
This item is original.
11.00 x 8.50 x 0.10 inches
This manual covers 1974 Chevy & GMC forward control truck chassis, including three-quarter ton, one ton, P 10, P 20, P 30, P 1500, P 2500, P 3500. To verify that this is the correct diagram for your truck, you can check your VIN code. The 2nd digit should be a P for the forward control model, the 4th digit should be a 1, 2, or 3 to indicate the 10, 20, or 30 series, the 5th digit should be a 2 for chassis cowl, and the 6th digit should be a 4 for the 1974 model year. See my other items for the motorhome or stepvan diagram.
1974 Chevrolet P10 Van
1974 Chevrolet P20 Van
1974 Chevrolet P30 Van
1974 GMC P15/P1500 Van
1974 GMC P25/P2500 Van
1974 GMC P35/P3500 Van
1974 Chevrolet P10 Van 1974 Chevrolet P20 Van 1974 Chevrolet P30 Van 1974 GMC P15/P1500 Van 1974 GMC P25/P2500 Van 1974 GMC P35/P3500 Van