I havent had time to check it out because i was told today at work that my brake lights on my boat trailer were not working. Co-worker saw me driving back home from the lake Saturday and he was behind me and noticed my brake lights on my trailer were not working but i know they were plugged in to my truck. Im going to check the ground wires on my trailer and look to see if any wires are damaged but is the fuse in my 06 F150 for the trailer lights in the fuse box in side the truck or is it under the bed of the truck somewhere?

 

Its in the passenger side kick panel.

Check fuses 10, 13, 105, and 106

 

Had the same problem but my idle lamps on the trailer wouldnt work but when i pressed the brakes they came on. It was a fuse so just go with what GatorB8 said

 

All of those are for the trailer lights?

 

sometimes its just dirt of grit in the plug. i once had a trailer and when i would turn my head lights on my trailer breaks would lock up... i had to drive from Virginia to Nashville in the rain without lights or breaks on the trailer haha

 

They cover all of the outputs on your round trailer plug.

10 should be the brake lights.