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". Buy now for the best electrical repair info - the factory wiring diagram.
Chevrolet
1978 Truck Wiring Diagrams C, K-10 thru 35
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This book covers 1978 GMC ½-ton, ¾-ton, & 1 ton pickups as well as Suburban, and Blazer/Jimmy. Includes 2 wheel drive and 4 wheel drive models. Covers both gasoline and diesel engines.
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1978 Chevrolet C10 Big Ten Standard Cab Pickup 2-Door
1978 Chevrolet C10 Cheyenne Cab & Chassis 2-Door
1978 Chevrolet C10 Cheyenne Standard Cab Pickup 2-Door
1978 Chevrolet C10 Custom Deluxe Cab & Chassis 2-Door
1978 Chevrolet C10 Custom Deluxe Standard Cab Pickup 2-Door
1978 Chevrolet C10 Scottsdale Cab & Chassis 2-Door
1978 Chevrolet C10 Scottsdale Standard Cab Pickup 2-Door
1978 Chevrolet C10 Suburban Custom Deluxe Sport Utility 4-Door
1978 Chevrolet C10 Suburban Scottsdale Sport Utility 4-Door
1978 Chevrolet C20 Cheyenne Cab & Chassis 2-Door
1978 Chevrolet C20 Cheyenne Cab & Chassis 4-Door
1978 Chevrolet C20 Cheyenne Crew Cab Pickup 4-Door
1978 Chevrolet C20 Cheyenne Extended Cab Pickup 2-Door
1978 Chevrolet C20 Cheyenne Standard Cab Pickup 2-Door
1978 Chevrolet C20 Custom Deluxe Cab & Chassis 2-Door
1978 Chevrolet C20 Custom Deluxe Cab & Chassis 4-Door
1978 Chevrolet C20 Custom Deluxe Crew Cab Pickup 4-Door
1978 Chevrolet C20 Custom Deluxe Extended Cab Pickup 2-Door
1978 Chevrolet C20 Custom Deluxe Standard Cab Pickup 2-Door
1978 Chevrolet C20 Scottsdale Cab & Chassis 2-Door
1978 Chevrolet C20 Scottsdale Cab & Chassis 4-Door
1978 Chevrolet C20 Scottsdale Crew Cab Pickup 4-Door
1978 Chevrolet C20 Scottsdale Extended Cab Pickup 2-Door
1978 Chevrolet C20 Scottsdale Standard Cab Pickup 2-Door
1978 Chevrolet C20 Suburban Custom Deluxe Sport Utility 4-Door
1978 Chevrolet C20 Suburban Scottsdale Sport Utility 4-Door
1978 Chevrolet C30 Cheyenne Cab & Chassis 2-Door
1978 Chevrolet C30 Cheyenne Cab & Chassis 4-Door
1978 Chevrolet C30 Cheyenne Crew Cab Pickup 4-Door
1978 Chevrolet C30 Cheyenne Extended Cab Pickup 2-Door
1978 Chevrolet C30 Cheyenne Standard Cab Pickup 2-Door
1978 Chevrolet C30 Custom Deluxe Cab & Chassis 2-Door
1978 Chevrolet C30 Custom Deluxe Cab & Chassis 4-Door
1978 Chevrolet C30 Custom Deluxe Crew Cab Pickup 4-Door
1978 Chevrolet C30 Custom Deluxe Extended Cab Pickup 2-Door
1978 Chevrolet C30 Custom Deluxe Standard Cab Pickup 2-Door
1978 Chevrolet C30 Scottsdale Cab & Chassis 2-Door
1978 Chevrolet C30 Scottsdale Cab & Chassis 4-Door
1978 Chevrolet C30 Scottsdale Crew Cab Pickup 4-Door
1978 Chevrolet C30 Scottsdale Extended Cab Pickup 2-Door
1978 Chevrolet C30 Scottsdale Standard Cab Pickup 2-Door
1978 Chevrolet K10 Cheyenne Cab & Chassis 2-Door
1978 Chevrolet K10 Cheyenne Standard Cab Pickup 2-Door
1978 Chevrolet K10 Custom Deluxe Cab & Chassis 2-Door
1978 Chevrolet K10 Custom Deluxe Standard Cab Pickup 2-Door
1978 Chevrolet K10 Scottsdale Cab & Chassis 2-Door
1978 Chevrolet K10 Scottsdale Standard Cab Pickup 2-Door
1978 Chevrolet K10 Suburban Custom Deluxe Sport Utility 4-Door
1978 Chevrolet K10 Suburban Scottsdale Sport Utility 4-Door
1978 Chevrolet K20 Cheyenne Cab & Chassis 2-Door
1978 Chevrolet K20 Cheyenne Standard Cab Pickup 2-Door
1978 Chevrolet K20 Custom Deluxe Cab & Chassis 2-Door
1978 Chevrolet K20 Custom Deluxe Standard Cab Pickup 2-Door
1978 Chevrolet K20 Scottsdale Cab & Chassis 2-Door
1978 Chevrolet K20 Scottsdale Standard Cab Pickup 2-Door
1978 Chevrolet K20 Suburban Custom Deluxe Sport Utility 4-Door
1978 Chevrolet K20 Suburban Scottsdale Sport Utility 4-Door
1978 Chevrolet K30 Cheyenne Cab & Chassis 2-Door
1978 Chevrolet K30 Cheyenne Cab & Chassis 4-Door
1978 Chevrolet K30 Cheyenne Crew Cab Pickup 4-Door
1978 Chevrolet K30 Cheyenne Standard Cab Pickup 2-Door
1978 Chevrolet K30 Custom Deluxe Cab & Chassis 2-Door
1978 Chevrolet K30 Custom Deluxe Cab & Chassis 4-Door
1978 Chevrolet K30 Custom Deluxe Crew Cab Pickup 4-Door
1978 Chevrolet K30 Custom Deluxe Standard Cab Pickup 2-Door
1978 Chevrolet K30 Scottsdale Cab & Chassis 2-Door
1978 Chevrolet K30 Scottsdale Cab & Chassis 4-Door
1978 Chevrolet K30 Scottsdale Crew Cab Pickup 4-Door
1978 Chevrolet K30 Scottsdale Standard Cab Pickup 2-Door
1978 Chevrolet K5 Blazer Cheyenne Sport Utility 2-Door
1978 Chevrolet K5 Blazer Custom Deluxe Sport Utility 2-Door
1978 GMC C15 Cab & Chassis 2-Door
1978 GMC C15 Heavy Half Standard Cab Pickup 2-Door
1978 GMC C15 High Sierra Cab & Chassis 2-Door
1978 GMC C15 High Sierra Standard Cab Pickup 2-Door
1978 GMC C15 Sierra Classic Cab & Chassis 2-Door
1978 GMC C15 Sierra Classic Standard Cab Pickup 2-Door
1978 GMC C15 Sierra Grande Cab & Chassis 2-Door
1978 GMC C15 Sierra Grande Standard Cab Pickup 2-Door
1978 GMC C15 Standard Cab Pickup 2-Door
1978 GMC C15 Street Coupe Standard Cab Pickup 2-Door
1978 GMC C15 Suburban High Sierra Sport Utility 4-Door
1978 GMC C15 Suburban Sierra Classic Sport Utility 4-Door
1978 GMC C15 Suburban Sierra Grande Sport Utility 4-Door
1978 GMC C15 Suburban Sport Utility 4-Door
1978 GMC C25 Cab & Chassis 2-Door
1978 GMC C25 Cab & Chassis 4-Door
1978 GMC C25 Crew Cab Pickup 4-Door
1978 GMC C25 Extended Cab Pickup 2-Door
1978 GMC C25 High Sierra Cab & Chassis 2-Door
1978 GMC C25 High Sierra Cab & Chassis 4-Door
1978 GMC C25 High Sierra Crew Cab Pickup 4-Door
1978 GMC C25 High Sierra Extended Cab Pickup 2-Door
1978 GMC C25 High Sierra Standard Cab Pickup 2-Door
1978 GMC C25 Sierra Classic Cab & Chassis 2-Door
1978 GMC C25 Sierra Classic Cab & Chassis 4-Door
1978 GMC C25 Sierra Classic Crew Cab Pickup 4-Door
1978 GMC C25 Sierra Classic Extended Cab Pickup 2-Door
1978 GMC C25 Sierra Classic Standard Cab Pickup 2-Door
1978 GMC C25 Sierra Grande Cab & Chassis 2-Door
1978 GMC C25 Sierra Grande Cab & Chassis 4-Door
1978 GMC C25 Sierra Grande Crew Cab Pickup 4-Door
1978 GMC C25 Sierra Grande Extended Cab Pickup 2-Door
1978 GMC C25 Sierra Grande Standard Cab Pickup 2-Door
1978 GMC C25 Standard Cab Pickup 2-Door
1978 GMC C25 Suburban High Sierra Sport Utility 4-Door
1978 GMC C25 Suburban Sierra Classic Sport Utility 4-Door
1978 GMC C25 Suburban Sierra Grande Sport Utility 4-Door
1978 GMC C25 Suburban Sport Utility 4-Door
1978 GMC C35 Cab & Chassis 2-Door
1978 GMC C35 Cab & Chassis 4-Door
1978 GMC C35 Crew Cab Pickup 4-Door
1978 GMC C35 Extended Cab Pickup 2-Door
1978 GMC C35 High Sierra Cab & Chassis 2-Door
1978 GMC C35 High Sierra Cab & Chassis 4-Door
1978 GMC C35 High Sierra Crew Cab Pickup 4-Door
1978 GMC C35 High Sierra Standard Cab Pickup 2-Door
1978 GMC C35 Sierra Classic Cab & Chassis 2-Door
1978 GMC C35 Sierra Classic Cab & Chassis 4-Door
1978 GMC C35 Sierra Classic Crew Cab Pickup 4-Door
1978 GMC C35 Sierra Classic Standard Cab Pickup 2-Door
1978 GMC C35 Sierra Grande Cab & Chassis 2-Door
1978 GMC C35 Sierra Grande Cab & Chassis 4-Door
1978 GMC C35 Sierra Grande Crew Cab Pickup 4-Door
1978 GMC C35 Sierra Grande Standard Cab Pickup 2-Door
1978 GMC C35 Standard Cab Pickup 2-Door
1978 GMC Jimmy High Sierra Sport Utility 2-Door
1978 GMC Jimmy Sierra Classic Sport Utility 2-Door
1978 GMC Jimmy Sierra Grande Sport Utility 2-Door
1978 GMC Jimmy Sport Utility 2-Door
1978 GMC Jimmy Street Coupe Sport Utility 2-Door
1978 GMC K15 Cab & Chassis 2-Door
1978 GMC K15 High Sierra Cab & Chassis 2-Door
1978 GMC K15 High Sierra Standard Cab Pickup 2-Door
1978 GMC K15 Sierra Classic Cab & Chassis 2-Door
1978 GMC K15 Sierra Classic Standard Cab Pickup 2-Door
1978 GMC K15 Sierra Grande Cab & Chassis 2-Door
1978 GMC K15 Sierra Grande Standard Cab Pickup 2-Door
1978 GMC K15 Standard Cab Pickup 2-Door
1978 GMC K15 Suburban High Sierra Sport Utility 4-Door
1978 GMC K15 Suburban Sierra Classic Sport Utility 4-Door
1978 GMC K15 Suburban Sierra Grande Sport Utility 4-Door
1978 GMC K15 Suburban Sport Utility 4-Door
1978 GMC K25 Cab & Chassis 2-Door
1978 GMC K25 Extended Cab Pickup 2-Door
1978 GMC K25 High Sierra Cab & Chassis 2-Door
1978 GMC K25 High Sierra Standard Cab Pickup 2-Door
1978 GMC K25 Sierra Classic Cab & Chassis 2-Door
1978 GMC K25 Sierra Classic Standard Cab Pickup 2-Door
1978 GMC K25 Sierra Grande Cab & Chassis 2-Door
1978 GMC K25 Sierra Grande Standard Cab Pickup 2-Door
1978 GMC K25 Standard Cab Pickup 2-Door
1978 GMC K25 Suburban High Sierra Sport Utility 4-Door
1978 GMC K25 Suburban Sierra Classic Sport Utility 4-Door
1978 GMC K25 Suburban Sierra Grande Sport Utility 4-Door
1978 GMC K25 Suburban Sport Utility 4-Door
1978 GMC K35 Cab & Chassis 2-Door
1978 GMC K35 Cab & Chassis 4-Door
1978 GMC K35 Crew Cab Pickup 4-Door
1978 GMC K35 Extended Cab Pickup 2-Door
1978 GMC K35 High Sierra Cab & Chassis 2-Door
1978 GMC K35 High Sierra Cab & Chassis 4-Door
1978 GMC K35 High Sierra Crew Cab Pickup 4-Door
1978 GMC K35 High Sierra Standard Cab Pickup 2-Door
1978 GMC K35 Sierra Classic Cab & Chassis 2-Door
1978 GMC K35 Sierra Classic Cab & Chassis 4-Door
1978 GMC K35 Sierra Classic Crew Cab Pickup 4-Door
1978 GMC K35 Sierra Classic Standard Cab Pickup 2-Door
1978 GMC K35 Sierra Grande Cab & Chassis 2-Door
1978 GMC K35 Sierra Grande Cab & Chassis 4-Door
1978 GMC K35 Sierra Grande Crew Cab Pickup 4-Door
1978 GMC K35 Sierra Grande Standard Cab Pickup 2-Door
1978 GMC K35 Standard Cab Pickup 2-Door
1978 Chevrolet C10 1978 Chevrolet C10 Suburban 1978 Chevrolet C20 1978 Chevrolet C20 Suburban 1978 Chevrolet C30 1978 Chevrolet K10 1978 Chevrolet K10 Suburban 1978 Chevrolet K20 1978 Chevrolet K20 Suburban 1978 Chevrolet K30 1978 Chevrolet K5 Blazer 1978 GMC C15 1978 GMC C15 Suburban 1978 GMC C25 1978 GMC C25 Suburban 1978 GMC C35 1978 GMC Jimmy 1978 GMC K15 1978 GMC K15 Suburban 1978 GMC K25 1978 GMC K25 Suburban 1978 GMC K35