That was the perfect link. I also found out NEVER probe or mess with a wire that has a yellow tag as that is part of the air bag system.
Though on my fuse panel there is a breaker in place and labeled for a brake controller.
With this link I will finish wiring the Colorado this weekend as we ( maybe I ) will be camping Halloween weekend and following Wisconsin 35 south to Alma. That road has the steepest grades around and will be a great way to see how the Colorado handles the Casita
thanks Carol for the help when I googled I did not find that site.