"1991 Sierra Models Electrical Diagrams & Diagnosis Manual" 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 all 1991 C and K Sierra Pickup Truck models, including half ton, three-quarter ton, one ton, 1500, 2500, 3500, extended cab, dually, two wheel drive and four wheel drive. Includes both gas and diesel engines. This manual covers the "new style" C/K trucks for 1991, they do NOT have wing windows. If your truck has wing windows, see the R/V series truck manual. This book measures 17.25" x 11" and is 0.5" thick. Buy now for the best electrical information available.
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