I have an 04 3500 quad cab diesel 4x4 dually. The other day I was driving home with a trailer on and I noticed that my break lights were on even with my foot off the pedal. I changed the switch on the pedal and re-did all the wires for my trailer plugs and the lights are still on. Does any one have any clue what the problem could be and what I need to do to fix it. Any help would be greatly appreciated.

Thanks Ken