Troubleshooting Trailer Interior Lights Not Working

Published 08/23/2018

Products Featured in This Question

Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End

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$7.32

Hook Probe Circuit Tester

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$13.14

Question:

I bought a 2017 24ft Leonard enclosed trailer and I can not get my inside lights to come on. I pull it with a 2018 Ford F-150.

asked by: Frankie C

Expert Reply:

Typically interior lights on a trailer would be powered by the 12 volt accessory circuit of the 7-way wiring which happens to be the circuit in the 1:00 position as you face the opening of the female 7-way socket. First thing I would do is test this circuit on the 7-way with a tester like part # PTW2993 to see if you have the circuit active as for some vehicles it's not. If it's not active I'd check under the hood for fuses/relays associated with 12 volt accessory trailer wiring and either replace or install as needed.

If that circuit is active then the issue is most likely the wiring of the trailer which you'd have to verify the voltage was making it to each light and that the lights themselves are grounded properly.

expert reply by: Jameson C