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No Left Side Stop or Turn Signal Lights on Trailer After New Harness Installed

Question:

I replaced everything and was working fine, now out of the sudden the left side stop working, signal, stop , and everything is new

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Expert Reply:

The most common problem we see with intermittent function in regards to trailer lights are poor grounds. Most likely, this is the issue that you are having as well. Therefore, I recommend you reground the left side tail light whether that be with a ground wire or via the mounting hardware.

If the left side tail light still does not work when the ground is re-secured then you might have an issue with a fuse on the vehicle. If you test the vehicle side trailer connector for power that would then allow you to rule this issue out. However, you most likely just have a ground problem.

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Conner L

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