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How to Wire Up New 4-Way to Trailer When Wire Color Functions are Unknown

Question:

A dog chewed the plug of my boat trailer lighting harness it has 5 wires going in and a 4 way coming out what do I need it has 2green 1yellow 1br own and a white I need to splice the wires with the correct color wires..

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Expert Reply:

It's interesting that your trailer connector has two green wires but aside from that standard wire colors. Typically white is ground, brown is running lights (where you would normally see 2 wires of same color), yellow is left turn/stop, and green is right turn/stop.

You might try putting 12 volts via a car battery on both of the green wires to see what they illuminate. You may even try this for all of the color wires minus the white to make sure you have the functions determined. For the new 4-way # A20WB you would then need to use the color functions I mentioned to wire to the trailer wires.

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Jameson C

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