It is sort of strange that your tail lights would just go bad. Everytime I have something like this happen it is 99% of the time associated with the contacts in the 7-way trailer connector. I always squirt in WD-40 in the contacts before hooking up and move the the plug around good before snaping in place.
I have had a shorted automotive bulb in the light fixture cause this problem as well...
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"