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The Main Reason for Nearly All Trailer Wiring Problems

Question:

having issues with the trailer markers light and tail, blinker, and brake light. would like to rewire it but not sure how the wire runs in a 1981 shasta camper

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Expert Reply:

Rewiring a travel trailer like yours would be pretty challenging as you will need to most likely remove interior walls to access the wiring. Since it would be much easier to check the grounds first (as that is most likely the actual problem) I recommend you start there.

Nearly all trailer wiring issues are ground related. Try finding a better ground for the light assemblies on your trailer to see if the issues you are having go away. Some assemblies ground through their mounting hardware. If yours are like this you will need to make sure your lights are connected to a clean metal surface that is connected to the trailer frame. If they ground with a wire make sure it is also connected to a clean metal surface attached to the trailer frame. Or you can run a jumper wire from the assemblies to the main ground wire of the trailer.

I also attached a picture that shows a generic diagram for trailer wiring.

I also attached a help article on trailer wiring plus one for troubleshooting the trailer wiring on a tow vehicle.

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expert reply by:
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Jameson C

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