class c rear plus

[freelander07]

when I plug my car dolly into my rv all lights work but the running lights, I have a set of towing lights and when I plus them in the same thing happens signal lights work, break lights and flasher work but no running lights. what should I check

[Murf2u]

If it's a Ford chassis, there's a second fuse panel under the hood, it has 3 fuses for the trailer plug, left turn / brake, right turn/ brake and running lights.

I'll bet the running light fuse is blown.

[freelander07]

Thanks murf 2u that was exactly the problem changed the fuse today everything is working right. Tks so much you saved me a lot of time and money as I was going to the rv shop for repair

[Murf2u]

Happy to help. I had that issue lots with my Ford pickups, on the duallys though they had a clever trick.

The rear fender clearance lights were powered by the trailer running lights. If the fender lights were on but not the trailer, it's wiring (plug mostly) but if the fender lights are were out too you had a blown fuse.