Looks like guidry is holding out for another Northern Lite owner to have the same issue. Probably will be a while.
I suggested a swapped wire because I had it happen on an extension. In our case all lights worked fine, but the brakes were locked on on that side. I also had to rewire my TC when I switched trucks. Probably because the guy that wired the extension tried to match the truck wiring which was wrong. No issues with a 4 pin on the extension, btw. It was that way for years until I pulled my wife's uncle's TT. So, look for electric brake attached to the wrong connector.