Dome Lights Are Not Working In Enclosed Trailer With 7-Way Connector

Question:

Have a F-150 STX Ford P/U and towing a 7 x 16foot enclosed trailer with the tow pkg. already hooked up. All lights work except for the 2 dome lights in the trailer? No sure what to do. Dealer said something about a 12V Fuse? Not sure about this and if so where would it go? Looking for help. Thanks!

asked by: J B

Helpful Expert Reply:

The first thing I recommend is to use a tester like part # PTW2993 and check the 12V circuit on the wiring connector on the truck. If you have no current showing there may be a fuse missing or blown for that circuit. You would want to check the owner's manual or with your dealership to see which fuse is dedicated to that circuit.

There are times when the dome lights may be attached to the running light circuit. You may want to try turning on the truck headlights when the trailer is hooked up and flip the light switch on to see if they work with the headlights.

If the lights are run from a battery located on the trailer, you will want to make sure the battery is charged, and the lights are connected correctly. If the dome lights are connected to the 12V circuit from the trailer connector, then you will want to make sure the wiring for the dome lights is in good shape and are grounded to a clean, bare metal surface. Check for current at the light fixture and work your way forward to the connector to find the problem.

I have attached a helpful article for trailer wiring you can check out.

expert reply by: Jeffrey L