4 Pin Round Trailer Wiring Diagram

4 Pin Round Trailer Wiring Diagram. The above are to Australian trailer wiring standards. Cut the four-pin plug off of the trailer harness.

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I put this here because I had a hard time finding and figuring this out for my trailers. But it really depends on the trailer plug. Not sure which wires attach to what on your trailer connectors?

This contact is less common, and may have completely different wiring than that shown here.

There should be a common color for both the tail lights.

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Verify the harness color codes at each tail light. Not sure which wires attach to what on your trailer connectors? The correct place to install the trailer tow harness, is in the factory connector for the seperate circuits for the.