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Troubleshooting No Running Lights Functioning on a Trailer While Other Circuits Work

Question:

Hello.. i just bought a 1987 Jerico 19 ft trailer trailer. . The guy said he got it rewired a month ago. I have a 2013 silverado hauling it all of the lights work great EXCEPT the running light tail lights dont work... I have a utility trailer also and all lights work when I haul it with the silverado. Please help. Going camping in a week

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Expert Reply:

Based on what you described it sounds like the running light circuit is somehow shorting out between the trailer connector and the light assemblies. A lot of trailer lighting issues are ground related, but since your brake lights are functioning the problem has to be somewhere on the taillight circuit itself.

I would start at the connector looking for any corrosion (fix as necessary) and then work your way back from there looking for any cut or exposed wires on the circuit to each light assembly. Since the wiring is allegedly new I would look for any wiring oversights on this circuit as well such as maybe the circuits was never even connected to the light assemblies.

I attached a couple FAQ articles on troubleshooting trailer wiring that you might find informative as well.

expert reply by:
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Jameson C

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