my jeep lights all work. break,headlight,turn signal, parking lights, all work. but on my boat trailer only the marking lights don"t work. factory tow package i have on my Jeep. i tested the 4 pin plug on my Jeep. only the park lights don"t have power from jeep 4 pin plug. they have work 2 years be for this.
Fuse #14 in the under hood fuse box (TIPM) powers the tow connector tail lights, this is the same circuit that powers the side marker lights on a trailer.