I have a 94 Pace Arrow J37, and want to install my Reese brake controller. The coach has the round plug already installed,and all the lights work when hooked up to my tow dolly with electric brakes. I was looking under the dash for some connector that I could hook up to. On the brake pedal switch, it looks like 2 switches each having plugs for 2 harnesses. One of the switches only has 1 harness pluged in, with the other one open. I checked with a test light on the open plug to see if I had power when pushing the brake pedal, but no luck. I imagine there is a wire that goes back to the plug on the end of the coach under the dash somewhere. Any idea what to look for or to test which wire it might be.