Tested the output at the receiver and everything works, plug in an adapter and only turn signals work...no taillights. Has anyone else had this problem or know a solution?

Tried several different adapters and had the same problem each time. Help!

 

Are the trailer tail lights LED? Are you able to test each pole on the 4 pin end of the adapter? I use one all the time and have had no issues, its possible the adapter is faulty