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How to Wire Up New 4-Way to Trailer that Doesn't Use Standard Wiring Colors

Question:

My trailer has a red and black wire as well as a brown and white wire. The new connector has yellow, green, brown and white. What connects to what?

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Expert Reply:

Your new connector uses the standard trailer wiring color code of:

White for ground
Green for right stop/turn
Yellow for left stop/turn
Brown for running lights

Your trailer most likely was wired with the color of wire that was most convenient so you will need to use a 12 volt battery with a jumper wire to test all of the circuits by applying voltage to each wire to see what is what. Most likely white is ground and brown is running lights.

expert reply by:
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Jameson C

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