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Troubleshooting a Trailer with no Left Turn Signal/Brake or Running Lights

Question:

I have a 2004 dodge 3500 and had a modulite 119190 about a year ago and we are about to go on a trip and I have no left turn signal brake or running light on the left side only. Is there a wire diagram available so I can trouble shoot it or do you have a suggestion on how to find the problem?

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Expert Reply:

I attached an FAQ article that has a trailer wiring diagram for you to check out. I strongly suspect that the problem is the ground on the left side taillight assembly since both functions on this side of the trailer are not working. Make sure it is grounding to a clean metal surface, some assemblies ground through the mounting hardware so you need to make sure the assembly is attached to a clean metal surface.

I attached an FAQ that should help you troubleshoot further if needed.

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expert reply by:
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Jameson C

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