Trailer Light Wiring Help - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 05-25-2009
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Trailer Light Wiring Help

my brother bought a trailer a few years ago and never ended up putting it together. I have all the parts and such but dont have the instructions to put it together.

I was looking at the light and it has two black wires and one red. i assumed the red was turn and the two black were the running lights and brake light wire. i took an old 4 pin wire set and started playing around with the light. i have tried every combination of wiring and i can get the running and turn signal to work but when ever i hit the brakes the whole light shuts off. any idea what i am doing wrong? do i need to have both lights hooked up for the brake light to work or what?
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Old 05-25-2009
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Trailer taillights typically have three wires coming from the lamp assembly. One wire for the running/park lights, one wire for turn/brake, and one wire to trailer frame ground.
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