Ava wrote:
If the tail lights work on the rv but not through the connector, look for a problem in the wiring between the rear rv lights and your connector. The rv lights are fused but they are generally not fused past that point.
Not so. The 7 way IS fused separate from the RV rear lighting. Has been for almost 25 years. They separate the wiring to prevent a short in the tow system from killing the RV lighting system/s. The OP just joined and needs to include Year/Brand/Model of RV to get accurate help. The fact he has no power to the light pin indicates the fuse for THAT wire is blown at the fuse panel for the rear towing circuit. Doug