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, & Chassis - SG-5500"
1
Included
This item is original.
8.50 x 11.00 x 0.10 inches
T7283
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Covers the S series 5500 bus chassis with a diesel engine. To verify that this is the correct diagram for your truck, you can check your VIN code. The 1st digit should be an S for the school bus chassis, the second digit should be a G for the DH478 GMC diesel engine.
1970 GMC Series 4500-6500
1970 GMC Series 4500-6500