CHEVY AND GMC TRUCK HEADLIGHT WIRING DIAGRAM

[Headlight wiring diagram - schematic]

This is a typical 1973 - 1987 headlight wiring schematic. Colors may or may not vary from year to year. One of the harnesses I have, had the sockets replaced at one time. The wires coming out of the sockets of the turn signals below the headlights are the same on both sides. Each has a yellow, a dark brown, and a black. Peeling off some tape, revealed which colors they were spliced into. I have a 1977, 1979, and a 1980 harness. All three had the same seven wire colors shown in my diagram. Missing in the diagram is the brown wire that feeds the left front marker lamp. It connects the same as the right side marker lamp brown wire (to the left front marker light).

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[Tail light wiring diagram - schematic]

 

Above is a typical wiring schematic / diagram for 1973 - 1987 Chevrolet Truck Tail Lights. Although the exact colors may vary
during these model years, the connections are the same.

Trailer Wiring T Connector 73 - 87 Chevy/GMC Truck Trailer Wiring T Connector 73 - 87 Chevy/GMC Truck


>A well kept secret...............For Automotive Literature it is hard to beat E Bay! GM Factory Service Manuals include full detailed instructions for replacing body panels. Every nut bolt and screw location, torque specs, and a ton more. These books are 2" thick, and often include full wiring diagrams too! Get over to E Bay!

  Click here for eBay Motors!  E Bay Motors - I have gotten many manuals there. Most recently, I picked up a GM 1982 Light Duty Truck Factory Service Manual, which includes a full wiring diagram. I won the bid for $17.00. Back in 1992, at a local swap meet, I paid $30 for the same GM factory Service manual for my 77. The older manuals didn't include wiring. I currently have a bid in myself on a 1977 GM Factory Wiring Manual. The bid is currently $10. I just also won a bid on a 1977 GM Dealer Album. It includes all pricing for all 1977 Chevrolet vehicles, the cost of all options, all the separate optional equipment catalogs (and believe me there are lots) even a brochure for the Blazer Chalet. There are paint chips, and fabric samples. It is jam packed with info. Forget Chilton's, forget Haynes, what you really need, is the GM Factory Service Manual for your GM vehicle. You can also find truck parts as well.

Factory Service Manuals!

GM Light Duty Truck Service Manuals cover the following models: C/10, C/20, C/30, K/10, K/20, K/30, P/10, P/20, P/30. (C= 2wd pickups, cab n' chassis, and Blazer / Suburban, K= 4wd pickups, cab n' chassis, and Blazer / Suburban, and the P model line is Chevy Vans. GM considers anything 1 ton or under to be a "Light Duty" vehicle.



So if you plan on restoring a car or truck, get your hands on a factory service manual, you will not be disappointed!


Click On A Book 		 

These are the REAL books you NEED and eBay has them.


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Wiring For Restorations


  • Fuse Box Diagrams

  • Plow Light Wiring Schematic

  • TRAILER LIGHTS

  • Headlight Schematic - Updated 4-19-03 - added tail light schematic

    		•

  • Light Bulbs, Fuses, & Circuit Breakers

  • Under Hood Wiring



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