* Faulty wiring: The most common cause of this problem is faulty wiring. Check the wiring between your truck and the trailer to make sure that there are no loose connections or broken wires.
* Faulty brake light switch: The brake light switch is responsible for turning on the trailer lights when you hit the brakes. If the brake light switch is faulty, the trailer lights will not come on when you brake.
* Faulty trailer light bulbs: It is also possible that the trailer light bulbs are faulty. Check the trailer light bulbs to make sure that they are not burnt out.
If you have checked all of these things and the trailer lights still go out when you hit the brakes, you may need to take your truck and trailer to a mechanic for further diagnosis.
Here are some additional tips for troubleshooting trailer light problems:
* Make sure that the trailer is properly connected to the truck.
* Check the fuse box for any blown fuses.
* Try using a different trailer to see if the problem is with the truck or the trailer.
If you are still having problems with your trailer lights, you can contact your local Ford dealer for assistance.
