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Troubleshooting Left Rear Trailer Light That Glows with Vehicle Turned Off


about 9 months after installation that seemed trouble free, I am finding that the left rear tail lights are glowing when vehicle is off. what gives?


Expert Reply:

It sounds like there may have been a short on your trailer that caused the converter box of Curt Wiring Harness part # C56330 to short out and now there is a low amount of voltage on your left rear tail light.

We see this problem a lot, and actually the # C56330 did its job and protected your vehicle wiring. They are designed to act like a fuse between your trailer wiring and vehicle wiring so that you do not damage your vehicle wiring.

You can further test the converter box by testing the circuits going into the box by function and then testing the output side as well.

What you will need to do is find the short on your trailer wiring and fix it as necessary and then install a new wiring harness. Look for obvious signs of shorts like cut or exposed wires.

I attached an FAQ on trailer wiring plus an FAQ on troubleshooting 4-way installs.

expert reply by:
Jameson C

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