Last week I had a wire in my 7 prong connector come loose from its connection, caused a short and blew the brake light fuse. The problem is that I was using my cruise control and when I hit the brakes, the cruise control would not turn off
It would turn off using the smart wheel on/off button, so it was not a giant problem, thank goodness. In addition, the Pac Brake would not go on, so it uses the voltage from that circuit also.
The problem was in the 7 prong connector to my tow car. In this case it was the ground wire. Some years ago when I made the connections, I obviously did not tighten enough.
Just thought I would post in case someone else had this happen.