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". 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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This book covers 1979 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. .

1979 Chevrolet C10 Big Ten Standard Cab Pickup 2-Door

1979 Chevrolet C10 Cheyenne Cab & Chassis 2-Door

1979 Chevrolet C10 Cheyenne Standard Cab Pickup 2-Door

1979 Chevrolet C10 Custom Deluxe Cab & Chassis 2-Door

1979 Chevrolet C10 Custom Deluxe Standard Cab Pickup 2-Door

1979 Chevrolet C10 Scottsdale Cab & Chassis 2-Door

1979 Chevrolet C10 Scottsdale Standard Cab Pickup 2-Door

1979 Chevrolet C10 Silverado Cab & Chassis 2-Door

1979 Chevrolet C10 Silverado Standard Cab Pickup 2-Door

1979 Chevrolet C10 Suburban Custom Deluxe Sport Utility 4-Door

1979 Chevrolet C10 Suburban Scottsdale Sport Utility 4-Door

1979 Chevrolet C10 Suburban Silverado Sport Utility 4-Door

1979 Chevrolet C20 Cheyenne Cab & Chassis 2-Door

1979 Chevrolet C20 Cheyenne Cab & Chassis 4-Door

1979 Chevrolet C20 Cheyenne Crew Cab Pickup 4-Door

1979 Chevrolet C20 Cheyenne Extended Cab Pickup 2-Door

1979 Chevrolet C20 Cheyenne Standard Cab Pickup 2-Door

1979 Chevrolet C20 Custom Deluxe Cab & Chassis 2-Door

1979 Chevrolet C20 Custom Deluxe Cab & Chassis 4-Door

1979 Chevrolet C20 Custom Deluxe Crew Cab Pickup 4-Door

1979 Chevrolet C20 Custom Deluxe Extended Cab Pickup 2-Door

1979 Chevrolet C20 Custom Deluxe Standard Cab Pickup 2-Door

1979 Chevrolet C20 Scottsdale Cab & Chassis 2-Door

1979 Chevrolet C20 Scottsdale Cab & Chassis 4-Door

1979 Chevrolet C20 Scottsdale Crew Cab Pickup 4-Door

1979 Chevrolet C20 Scottsdale Extended Cab Pickup 2-Door

1979 Chevrolet C20 Scottsdale Standard Cab Pickup 2-Door

1979 Chevrolet C20 Silverado Cab & Chassis 2-Door

1979 Chevrolet C20 Silverado Cab & Chassis 4-Door

1979 Chevrolet C20 Silverado Crew Cab Pickup 4-Door

1979 Chevrolet C20 Silverado Extended Cab Pickup 2-Door

1979 Chevrolet C20 Silverado Standard Cab Pickup 2-Door

1979 Chevrolet C20 Suburban Custom Deluxe Sport Utility 4-Door

1979 Chevrolet C20 Suburban Scottsdale Sport Utility 4-Door

1979 Chevrolet C20 Suburban Silverado Sport Utility 4-Door

1979 Chevrolet C30 Cheyenne Cab & Chassis 2-Door

1979 Chevrolet C30 Cheyenne Cab & Chassis 4-Door

1979 Chevrolet C30 Cheyenne Crew Cab Pickup 4-Door

1979 Chevrolet C30 Cheyenne Extended Cab Pickup 2-Door

1979 Chevrolet C30 Cheyenne Standard Cab Pickup 2-Door

1979 Chevrolet C30 Custom Deluxe Cab & Chassis 2-Door

1979 Chevrolet C30 Custom Deluxe Cab & Chassis 4-Door

1979 Chevrolet C30 Custom Deluxe Crew Cab Pickup 4-Door

1979 Chevrolet C30 Custom Deluxe Extended Cab Pickup 2-Door

1979 Chevrolet C30 Custom Deluxe Standard Cab Pickup 2-Door

1979 Chevrolet C30 Scottsdale Cab & Chassis 2-Door

1979 Chevrolet C30 Scottsdale Cab & Chassis 4-Door

1979 Chevrolet C30 Scottsdale Crew Cab Pickup 4-Door

1979 Chevrolet C30 Scottsdale Extended Cab Pickup 2-Door

1979 Chevrolet C30 Scottsdale Standard Cab Pickup 2-Door

1979 Chevrolet C30 Silverado Cab & Chassis 2-Door

1979 Chevrolet C30 Silverado Cab & Chassis 4-Door

1979 Chevrolet C30 Silverado Crew Cab Pickup 4-Door

1979 Chevrolet C30 Silverado Extended Cab Pickup 2-Door

1979 Chevrolet C30 Silverado Standard Cab Pickup 2-Door

1979 Chevrolet K10 Cheyenne Cab & Chassis 2-Door

1979 Chevrolet K10 Cheyenne Standard Cab Pickup 2-Door

1979 Chevrolet K10 Custom Deluxe Cab & Chassis 2-Door

1979 Chevrolet K10 Custom Deluxe Standard Cab Pickup 2-Door

1979 Chevrolet K10 Scottsdale Cab & Chassis 2-Door

1979 Chevrolet K10 Scottsdale Standard Cab Pickup 2-Door

1979 Chevrolet K10 Silverado Cab & Chassis 2-Door

1979 Chevrolet K10 Silverado Standard Cab Pickup 2-Door

1979 Chevrolet K10 Suburban Custom Deluxe Sport Utility 4-Door

1979 Chevrolet K10 Suburban Scottsdale Sport Utility 4-Door

1979 Chevrolet K10 Suburban Silverado Sport Utility 4-Door

1979 Chevrolet K20 Cheyenne Cab & Chassis 2-Door

1979 Chevrolet K20 Cheyenne Standard Cab Pickup 2-Door

1979 Chevrolet K20 Custom Deluxe Cab & Chassis 2-Door

1979 Chevrolet K20 Custom Deluxe Standard Cab Pickup 2-Door

1979 Chevrolet K20 Scottsdale Cab & Chassis 2-Door

1979 Chevrolet K20 Scottsdale Standard Cab Pickup 2-Door

1979 Chevrolet K20 Silverado Cab & Chassis 2-Door

1979 Chevrolet K20 Silverado Standard Cab Pickup 2-Door

1979 Chevrolet K20 Suburban Custom Deluxe Sport Utility 4-Door

1979 Chevrolet K20 Suburban Scottsdale Sport Utility 4-Door

1979 Chevrolet K20 Suburban Silverado Sport Utility 4-Door

1979 Chevrolet K30 Cheyenne Cab & Chassis 2-Door

1979 Chevrolet K30 Cheyenne Cab & Chassis 4-Door

1979 Chevrolet K30 Cheyenne Crew Cab Pickup 4-Door

1979 Chevrolet K30 Cheyenne Standard Cab Pickup 2-Door

1979 Chevrolet K30 Custom Deluxe Cab & Chassis 2-Door

1979 Chevrolet K30 Custom Deluxe Cab & Chassis 4-Door

1979 Chevrolet K30 Custom Deluxe Crew Cab Pickup 4-Door

1979 Chevrolet K30 Custom Deluxe Standard Cab Pickup 2-Door

1979 Chevrolet K30 Scottsdale Cab & Chassis 2-Door

1979 Chevrolet K30 Scottsdale Cab & Chassis 4-Door

1979 Chevrolet K30 Scottsdale Crew Cab Pickup 4-Door

1979 Chevrolet K30 Scottsdale Standard Cab Pickup 2-Door

1979 Chevrolet K30 Silverado Cab & Chassis 2-Door

1979 Chevrolet K30 Silverado Cab & Chassis 4-Door

1979 Chevrolet K30 Silverado Crew Cab Pickup 4-Door

1979 Chevrolet K30 Silverado Standard Cab Pickup 2-Door

1979 Chevrolet K5 Blazer Cheyenne Sport Utility 2-Door

1979 Chevrolet K5 Blazer Custom Deluxe Sport Utility 2-Door

1979 GMC C1500 Cab & Chassis 2-Door

1979 GMC C1500 Heavy Half Standard Cab Pickup 2-Door

1979 GMC C1500 High Sierra Cab & Chassis 2-Door

1979 GMC C1500 High Sierra Standard Cab Pickup 2-Door

1979 GMC C1500 Sierra Classic Cab & Chassis 2-Door

1979 GMC C1500 Sierra Classic Standard Cab Pickup 2-Door

1979 GMC C1500 Sierra Grande Cab & Chassis 2-Door

1979 GMC C1500 Sierra Grande Standard Cab Pickup 2-Door

1979 GMC C1500 Standard Cab Pickup 2-Door

1979 GMC C1500 Street Coupe Cab & Chassis 2-Door

1979 GMC C1500 Street Coupe Standard Cab Pickup 2-Door

1979 GMC C1500 Suburban High Sierra Sport Utility 4-Door

1979 GMC C1500 Suburban Sierra Classic Sport Utility 4-Door

1979 GMC C1500 Suburban Sierra Grande Sport Utility 4-Door

1979 GMC C1500 Suburban Sport Utility 4-Door

1979 GMC C2500 Cab & Chassis 2-Door

1979 GMC C2500 Cab & Chassis 4-Door

1979 GMC C2500 Crew Cab Pickup 4-Door

1979 GMC C2500 Extended Cab Pickup 2-Door

1979 GMC C2500 High Sierra Cab & Chassis 4-Door

1979 GMC C2500 High Sierra Crew Cab Pickup 4-Door

1979 GMC C2500 High Sierra Extended Cab Pickup 2-Door

1979 GMC C2500 High Sierra Standard Cab Pickup 2-Door

1979 GMC C2500 Sierra Classic Cab & Chassis 2-Door

1979 GMC C2500 Sierra Classic Cab & Chassis 4-Door

1979 GMC C2500 Sierra Classic Crew Cab Pickup 4-Door

1979 GMC C2500 Sierra Classic Extended Cab Pickup 2-Door

1979 GMC C2500 Sierra Classic Standard Cab Pickup 2-Door

1979 GMC C2500 Sierra Grande Cab & Chassis 2-Door

1979 GMC C2500 Sierra Grande Cab & Chassis 4-Door

1979 GMC C2500 Sierra Grande Crew Cab Pickup 4-Door

1979 GMC C2500 Sierra Grande Extended Cab Pickup 2-Door

1979 GMC C2500 Sierra Grande Standard Cab Pickup 2-Door

1979 GMC C2500 Standard Cab Pickup 2-Door

1979 GMC C2500 Suburban High Sierra Sport Utility 4-Door

1979 GMC C2500 Suburban Sierra Classic Sport Utility 4-Door

1979 GMC C2500 Suburban Sierra Grande Sport Utility 4-Door

1979 GMC C2500 Suburban Sport Utility 4-Door

1979 GMC C3500 Cab & Chassis 2-Door

1979 GMC C3500 Cab & Chassis 4-Door

1979 GMC C3500 Crew Cab Pickup 4-Door

1979 GMC C3500 Extended Cab Pickup 2-Door

1979 GMC C3500 High Sierra Cab & Chassis 2-Door

1979 GMC C3500 High Sierra Cab & Chassis 4-Door

1979 GMC C3500 High Sierra Crew Cab Pickup 4-Door

1979 GMC C3500 High Sierra Standard Cab Pickup 2-Door

1979 GMC C3500 Sierra Classic Cab & Chassis 2-Door

1979 GMC C3500 Sierra Classic Cab & Chassis 4-Door

1979 GMC C3500 Sierra Classic Crew Cab Pickup 4-Door

1979 GMC C3500 Sierra Classic Standard Cab Pickup 2-Door

1979 GMC C3500 Sierra Grande Cab & Chassis 2-Door

1979 GMC C3500 Sierra Grande Cab & Chassis 4-Door

1979 GMC C3500 Sierra Grande Crew Cab Pickup 4-Door

1979 GMC C3500 Sierra Grande Standard Cab Pickup 2-Door

1979 GMC C3500 Standard Cab Pickup 2-Door

1979 GMC Jimmy High Sierra Sport Utility 2-Door

1979 GMC Jimmy Sierra Classic Sport Utility 2-Door

1979 GMC Jimmy Sierra Grande Sport Utility 2-Door

1979 GMC Jimmy Sport Utility 2-Door

1979 GMC Jimmy Street Coupe Sport Utility 2-Door

1979 GMC K1500 Cab & Chassis 2-Door

1979 GMC K1500 High Sierra Cab & Chassis 2-Door

1979 GMC K1500 High Sierra Standard Cab Pickup 2-Door

1979 GMC K1500 Sierra Classic Cab & Chassis 2-Door

1979 GMC K1500 Sierra Classic Standard Cab Pickup 2-Door

1979 GMC K1500 Sierra Grande Cab & Chassis 2-Door

1979 GMC K1500 Sierra Grande Standard Cab Pickup 2-Door

1979 GMC K1500 Standard Cab Pickup 2-Door

1979 GMC K1500 Suburban High Sierra Sport Utility 4-Door

1979 GMC K1500 Suburban Sierra Classic Sport Utility 4-Door

1979 GMC K1500 Suburban Sierra Grande Sport Utility 4-Door

1979 GMC K1500 Suburban Sport Utility 4-Door

1979 GMC K2500 Cab & Chassis 2-Door

1979 GMC K2500 Extended Cab Pickup 2-Door

1979 GMC K2500 High Sierra Cab & Chassis 2-Door

1979 GMC K2500 High Sierra Standard Cab Pickup 2-Door

1979 GMC K2500 Sierra Classic Cab & Chassis 2-Door

1979 GMC K2500 Sierra Classic Standard Cab Pickup 2-Door

1979 GMC K2500 Sierra Grande Cab & Chassis 2-Door

1979 GMC K2500 Sierra Grande Standard Cab Pickup 2-Door

1979 GMC K2500 Standard Cab Pickup 2-Door

1979 GMC K2500 Suburban High Sierra Sport Utility 4-Door

1979 GMC K2500 Suburban Sierra Classic Sport Utility 4-Door

1979 GMC K2500 Suburban Sierra Grande Sport Utility 4-Door

1979 GMC K2500 Suburban Sport Utility 4-Door

1979 GMC K3500 Cab & Chassis 2-Door

1979 GMC K3500 Cab & Chassis 4-Door

1979 GMC K3500 Crew Cab Pickup 4-Door

1979 GMC K3500 Extended Cab Pickup 2-Door

1979 GMC K3500 High Sierra Cab & Chassis 2-Door

1979 GMC K3500 High Sierra Cab & Chassis 4-Door

1979 GMC K3500 High Sierra Crew Cab Pickup 4-Door

1979 GMC K3500 High Sierra Standard Cab Pickup 2-Door

1979 GMC K3500 Sierra Classic Cab & Chassis 2-Door

1979 GMC K3500 Sierra Classic Cab & Chassis 4-Door

1979 GMC K3500 Sierra Classic Crew Cab Pickup 4-Door

1979 GMC K3500 Sierra Classic Standard Cab Pickup 2-Door

1979 GMC K3500 Sierra Grande Cab & Chassis 2-Door

1979 GMC K3500 Sierra Grande Cab & Chassis 4-Door

1979 GMC K3500 Sierra Grande Crew Cab Pickup 4-Door

1979 GMC K3500 Sierra Grande Standard Cab Pickup 2-Door

1979 GMC K3500 Standard Cab Pickup 2-Door

1979 Chevrolet C10 1979 Chevrolet C10 Suburban 1979 Chevrolet C20 1979 Chevrolet C20 Suburban 1979 Chevrolet C30 1979 Chevrolet K10 1979 Chevrolet K10 Suburban 1979 Chevrolet K20 1979 Chevrolet K20 Suburban 1979 Chevrolet K30 1979 Chevrolet K5 Blazer 1979 GMC C1500 1979 GMC C1500 Suburban 1979 GMC C2500 1979 GMC C2500 Suburban 1979 GMC C3500 1979 GMC Jimmy 1979 GMC K1500 1979 GMC K1500 Suburban 1979 GMC K2500 1979 GMC K2500 Suburban 1979 GMC K3500