Friend put my 2004 Ram 1500 on it's side recently and I was looking over the damage and noticed a cut harness hanging from under driver's side of dash. Blue 4-wire connector and has a tag on it that says "Vehicle brake sense input". Any idea where the other end goes??? I've attached a pic of the harness. It's a clean cut, so I'm not sure if it went to something insurance took? Or if it was for some kind of brake controller previous owner had in?

 

Looks like the pre wired trailer brake plug for adding a trailer brake controller

 

Well I unplugged this from the harness, so the truck harness is intact. Any idea where the other end of this harness would go? Like where the trailer brake controller normally mounts? It looks factory.