I know this is an old thread, but was wondering if 2002 Ford F250s also have the trailer running light relay integrated into the fuse box (Central Junction Box). I hope it's different for the 2002!!!
I've read just about every post on all of the Ford truck forums, and this is a common problem. However, I have not seen a good solution or a good method to troubleshoot the problem. I've done the basics like checking the ground, verified the other pins on the tow connector are working, and they are. Also checked the applicable fuses in the fuse panel with a meter, and they are good.
My only plan right now is to start tracing the wire from the hitch connector to the fuse box.
If anyone has any ideas, and/or a circuit diagram that you could send my way, I would really appreciate it.
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