This is the original wiring diagram printed by GMC for dealer mechanics. You can follow the wiring in your truck for the specific optional equipment in the title. 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, nor will you find it in the main diagram for your truck. 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.
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