I tow with a "heavy duty" payload and tow package Ford F150. My problem is the reverse. Tail lights, brake and turn signals work but the dash info regularly tells me "trailer disconnected." Apparently Ford has a reputation for issues with its trailer brakes and trailer connection. Google it. I was told that the trailer was recognizing the truck, thus the working lights, but the truck was not recognizing the trailer, thus the message and MAYBE no brakes. After cleaning the hell out of the contacts and strapping the plug in with a locking pull tie, I have not had the problem for the last month or so. The Ford connection is very temperamental but, it does work, I hope. PS: I also chased bad grounds but didn't find any in the truck or trailer.