Written for GM dealership mechanics, this factory-published original wiring diagram shows you how to follow the wiring from bumper-to-bumper. It will help you understand connector configurations, and locate and identify circuits, relays, and grounds. These are the same as the wiring diagrams in the factory shop manual. Wiring diagrams are black and white, but they frequently have color codes printed on each line of the diagram that represents a wire. This book is a collection of all the wiring schematics, and component/connector views FROM the shop manual (so it is the same as the electrical section of the shop manual). Buy now for the best electrical information available.
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