Standard Color Code for Wiring Simple 4 Wire Trailer Standard Color Code for Wiring Simple 4 Wire Trailer Lighting Standard Color Code for Wiring Simple 4 Wire Trailer Lighting. Question: I have had to mess with trailer wiring for years, once or twice a year anyway, and I just cannot keep the color code right, ect white/ground, brn/ running lights, grn/ right turn, yellow left turn?4.8/5(91)Brand: DekaWiring FAQ · 16-4B-1 What is the Factory Wiring Harness Color Code for a 2007 We had a 2007 Chevy Silverado with the factory trailer wiring on our lot, so I went out and verified that it had the same color code. I also noticed a white tag on the wiring harness that listed the functions of each wire color. Depending on where your trailer connector ripped off, you may have a white tag on your wires as well.
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