2004 Ford F250 trailer lights fuse location and wiring sch Nov 23, 20092004 Ford F250 trailer lights fuse location and wiring sch - Answered by a verified Ford Mechanic This may be due to an open trailer tow fuse, a concern in the vehicle's wiring, a concern in the trailer's wiring, or the trailer not being wired properly for the vehicle. I have no tail lights or running lights on trailer. 2004 F250 Brake Controller Fuse Location On A 2004 Ford F-250 The brake controller fuse on a 2004 Ford F-250 is located at the 101 fuse location in the front of the vehicle's fuse box labeled as "Trailer tow electric brake". I have also attached a picture that will show this location. Click to Enlarge. helpful expert reply by: Conner L.