First let me start by saying I have done 3 or 4 searches to no avail. I drive a 06 Ford F150 and my brake/turn signals on any boat trailer I tow do not work. However my running lights and normal lights on the trailers work they just dont brighten or blink when the signal or brake is on. I have a feeling its a fuse only I can not figure out which one it is. If anyone can help I would greatly appreciate it. Thanks

 

Do you have an owner's manual? It has a full fuse and relay chart. If you don't have one you can download it from https://www.fleet.ford.com/maintenan...ls/default.asp.