I had the dealership install the hitch, a 7 pin wiring harness and brake controller. It's all neatly contained in the bumper enclosure so looks like it should readily accept a 7pin wiring harness. I don't know if doing it yourself voids the warranty, but the Telly should be set up to accept one. We had no problems with our 2016 Sorento with a 7 pin harness and brake controller either.Has anyone hard wired a trailer brake switch? If so did it cause any problems or is everything as smooth and operating properly? I’m worried about messing up electronics and voiding a warranty!