If the tail light still works, it's not the ground. Check to see if the prongs on the connecting cord are clean. Also check to see if there is power coming from the TV. The problem might not be on the trailer.
"Sometimes I wonder if the world is being run by smart people who are putting us on, or by imbeciles who really mean it." Mark Twain
AIR 22749 WBCCI 2349 NOVA TAC TN-6
1989 345 LE Classic Motorhome