Hey guys so I need some help figuring out where I should be looking to fix this problem. When I use a 4 way plug on a trailer everything on it works except when I turn on my headlights-then there is nothing. This happens with trailers and also my led light bar which also had a 4 way plug. I've looked at the manual for fuses but it looked like they were fine, tried to find any that seemed related to the issue. Any help is appreciated thanks

 

Sounds like a short. There are diagram online. Figure out which one controls the "park" feature in the 4 way then trace the wire back