"1990 Medium Truck C5D, C6D, C7D, B6P, S7T, P4T, P6T Models Wiring Diagrams" Written for GMC 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. You will not find these 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 manual covers 1990 GMC & Chevy Medium Duty Truck models (except Forward/Tiltmaster/Topkick/Kodiak), including C, B, P, & S, 40, 4000, 50, 5000, 60, 6000, 70, and 7000 series. It includes conventional models in two wheel drive and four wheel drive as well as forward control chassis and S7 & B6 bus chassis. This book measures 17.25" x 11" and is 0.5" thick Buy now for the best electrical information available.
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