Question about 1993 Chevrolet C1500
I had this same problem it end up being a connector where it split off to tail lights did not have continuity I replaced the connector with solder and heat shrink might give it a try .
hopefuly this will help you
Posted on Oct 09, 2008
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Right Turn & Brake
Left Turn & Brake
Green- Right Turn and Brake
Yellow- Left Turn and Brake
Brown- Tail Lights
Red- Reverse (Back Up) Lights
Blue- Electric Brakes
Purple- Auxiliary Power
It sounds like your green and yello wires are shorted together somewhere along the length of the harness. I would check the wires on the trailer first. Easier yet, if you have another trailer to connec or access to another to use for testing, connect to it and see if the problem repeats; if it does the trouble is in the vehicle's wiring.
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