Had running lights when we left Goshen. Next morning after hooking up, no running lights. All other lights work, brakes ,flashers turn sigs. Replaced fuse under hood of tv, checked connections and cleaned. Still no lights. While at Goshen the techs replaced the entire front of the tt, checked the lights after repair and they worked. I'm not very sharp on electrical I noticed that one bulb is used for all functions on the tail light but will not work for running lights. Also the marker lights are also not working. Any ideas.
2012 F250 6.2 gasser 373 rear
2013 Rockwood 2104S Mini Lite