runnin light failure

[luvfishin]

My boat trailers running lights do not work when connected to my 2005 F 350 6L Diesel. They do work properly on my 2006 F150 5.4, both have towing packages, used same connector for both and the turn signals and brake lights perform properly on the trailer on both trucks. I checked the owners manuel for both the under steering column fuse panel and the underhood power distribution panel. Neither have obvious fuse problems and the manuel does not list trailer tow running lights in either location. Does anyone have a diagram or know the fuse or relay that believe I may have a problem with???

[FarmerK]

On my 07, the fuse is located under the steering wheel in the fuse box. I know it is a 20 amp located along the bottom near the middle, off to the left. Sorry, I don't remember the exact position, but the truck is 40 miles away from me right now.
I use a red "Sharpie" and wrote a "T" on the fuse when I replaced it. It will help me locate in a hurry next time.
Be sure to use a test light on the fuse to be sure it is good. Also, be sure there is no corrosion on the termianl inside your plug. Mine will turn green from winter/salt. Clean it with baking soda & vinegar.