I have a 2005 Chevy Colorado 4x4, and I have just wired a basic 4 way trailer light kit onto my utility trailer, with no problems. I am now attempting to splice the 4 way tow vehicle plug and wiring, into my truck's brake and trailer light harness, but the wires that I found routed between the truck's lights are all 3 black. The trailer light splice is Brown, Green, Yellow and White. I understand the white, but how is best to determine which of the 3 black wires connect to the color coded wires? Admittedly, I am a novice, but any guidance that you could provide would greatly appreciated. Thanks so much.
get a test light probe and test which one is which when you turn them on. 5 bucks at the auto parts store. it has a needle point that sticks though the insulation
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