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Troubleshooting Right Side Trailer Wiring that Stopped Functioning

Question:

Lost all run brake and turn signal on right side of trailer Tested truck plug and all pins work when lights are applied. Replace the trailer plug harness for some corrosion on pins. I get same response no lights.

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Expert Reply:

Since you lost all of the signals at once on one side of the trailer that makes me think you have a ground problem on that assembly. Most lights ground through the mounting hardware so make sure your light is mounted to a clean metal surface. Or you can run a jumper wire from the mounting hardware (or ground wire if equipped) back to the frame or the main wiring connector of the trailer.

I attached a link to a troubleshooting guide for trailer wiring for you to check out as well.

expert reply by:
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Jameson C

Question:

Thanks for the follow up. I wasn’t getting enough ground to the right side lights. All good now.

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Expert Reply:

Glad you got it figured out!

expert reply by:
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Jameson C

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