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How to Test the Wiring of a Vehicle for Wiring a Trailer Connector

Question:

Hi...I have the following colors coming into a connector that I cannot find an adapter for: Blue Red Brown Black...Could you please tell me how to match these up to the wiring connector with the traditional white, brown, green and yellow wires...Thanks very much!

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Expert Reply:

Since trailer wiring colors on vehicles don't always follow what the industry standard wiring colors call for your best option would be to use a circuit tester like part # PTW2993 to test each of the wires by function and then wire it accordingly to your new connector.

Check out the video I attached that shows how to test the 4-way.

expert reply by:
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Jameson C

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