I have a 2006 Z21 Ranger... this weekend on the way to the lake I noticed that only one side of the trailer lights were working... both brake lights work...
also noted that the trailer plug was hot and partly melted the plug...

I have the trailer plugged into the 7 pin connection on the truck and have a 5 to 7 pin adapter in place.

Where do I start? Lights worked great day before.