Re: trailer running lights not working
If you have access to a volt meter or even a simple test light you can check the voltage at the connector on the vehicle. One connector is for left signal and brake, one for right signal and brake and the last one is your running lights. If you have voltage there, your problem is on the trailer or pigtail connector, and could very likely be a bad ground or a break in that wire. You should be able to trace it all the way back to the lights.
2012 Overland, Deep Cherry w/black/saddle interior, V6, ACC pkg.
"Pennies from heaven are soon followed by a tax collector from hell"
77 Cherokee- Long gone but not forgotten