Back again. I have an enclosed car hauler. Sometimes when you turn on the signal light the trailer brakes engage in sequence with the signal creating a herky-jerky turn. Sometimes it happens by applying the brake. I tried cleaning out the 7 pin connector and that seemed to have worked on an occasion or two but not consistently enough to say that is the problem. Any advice? I will be doing a complete going over in the spring, including adding a brake controller and rewiring to fix the interior lights as well. (any info on interior lights and supplemental battery install would be great) Thanks.