I have the same problem with my 03 3500 SRW. I called Hopkins who made my controller told them I also purchased the quick hookup harness that plugs into the blue plug near the back of the parking brake. Well they first asked me if I checked the fuse marked CHMSL I believe its like #20 in the fuse panel its for the cental high mounted stop light at the rear of the cab and its on its own circuit and thats what they are tapping into to run the brake controller. Well I checked my fuse and it was still good so Hopkins has a Lifetime warranty on the controllers that they make so I asumed that the controller must be bad. I returned it to where I purchased it did not even need a reciept. They gave me the new controller but after I installed it I still have no response when hitting the brake pedal. If I use the controller only button its getting a readout and my wiring had power to the plug on the controller. So if your lucky enough to have a blown fuse it may fix yours but I still have to hit my button. A freind of mine told me to run a ground wire directly to the controller itself he said if its not grounding itself it will cause the same problem. I am going to do that now. Good luck hope that helped out.