I have a 2020 ram 1500 with both a 7 round and 4 flat factory receptical. I use the 7 round to tow boat because of trailer brakes. Suddenly my trailer lights just stopped working so i checked the trailer plug first. I have power to left turn signal-12v chargring-reverse lights nothing else. No brake light no right turn signal no running lights. Where to i start looking? Are they on individual fuses because i know there is a master fuse for trailer but it it was working all would work? Im just confused