My brake lights and turn signals work .the strange part is that I just had a brake line go on my truck I replaced it but still the same no running lights when I turn the head lights on no camper tail ...
kohidad is right in that each circuit has a fuse.I gust looked a the block and NO fuse for running lights. The fuse for the running lights is under the hood.It is marked TRL PARK (Parking Lamps Trailer Wiring) It is on left side 3rd. row down from top of fuse block.