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LED Trailer Lights Not Working After Replacing 6-Way Connector with 4-Way Connector

Question:

I recently purchased a used trailer with LED lights. The previous owner had a 6 round plug going into a 7 round connector using an adapter. The lights worked fine on his truck saw it for myself. The lights were only wired for parking, brake, and signals. My 2006 Dodge Durango has a 4 prong connector so I decided to replace the 6 round plug off the trailer with a 4 flat since it has only 4 wires connected. The parking lights work but no brake or tail lights work. I tested the trailer connection off the Durango and the signals work. I reinstalled a new ground wire on the trailer and still nothing. Any other suggestions???

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Expert Reply:

If the trailer has separate amber turn signals then that could be why things are not working with the 4-Way flat. It is possible that the 6-Way it was using did have separate pins for brake lights and turn signals.

You can trace the wires manually to see where they terminate. You can also use a separate 12 volt battery to apply power to each of the wires to see what lights up. I also recommend checking both the vehicle and trailer side connectors and make sure they are free of corrosion inside and out.

If the trailer does have amber turn signals or if each wire only operates one function without any overlap then I recommend replacing the wiring and/or lights for combined stop/tail/turn lights such as # TLL9RK or # TLL36RK.

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