Troubleshooting Trailer Dome Lights

Updated 04/03/2021 | Published 04/02/2021

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Question:

2018 Chevy Colorado. All trailer lights work except the interior dome lights. Do you know which fuses by number that power the trailer dome lights. Thank you

asked by: Scott

Expert Reply:

It's fairly common to have the interior lights of an enclosed trailer powered by a switched circuit tapped into the trailer running lamp circuit. Try turning on the running lights, if the dome lights don't turn on then, look for a switch mounted in the inside of the trailer.

I've also seen interior lights powered from a switched circuit from the 12-volt feed from the 7-way trailer connector. Use a circuit tester like # PTW2993 on the pin in the 1:00 position in the 7-way. If that pin doesn't show power with the ignition on, check fuse locations 24 and 27 in the engine compartment fuse block.

I'd also recommend checking the bulb if it's an incandescent lamp.

expert reply by: Mike L