I know that we have had the discussion regarding the trailer brake controller in the past. I attempted to install a Tekonsha prodigy contoller this evening. I removed the driving light plug from the convenience center. connected the brake controller into the convenience center and got a SH reading on the controller. According to the directions this means that "The brake wire sees short at idle condition". Has anyone else used this controller or had a similar problem? What am I forgetting?