Have a 2011North Trails 28BRS camper and the overhead lights in the main cabin and outside porch light stopped working. They worked fine last night. This morning nothing. Everything else works (front,rear lights, outlets, etc). Checked all fuses, breakers and they are ok. Switched light switch with one that was working, nothing happen. Crossed wires and nothing. Any thing I missed? 2nd trip with our new camper and 2nd breakdown preventing us from leaving.