I'm really confused about the 04 1500 I just bought. It looked like it had the factory towing package, factory hitch, 7 pin connector in bumper, but nothing worked back there. I took a quick look under the truck and here are 4 pin connectors hanging down, both truck and trailer ends, if I plug them in to each other then almost everything works. The harness looks factory, but has butt splices everywhere around the 4 pin connectors. Also there is a seperate wire run very cheesy to the battery via a 20A fuse for the trailer hot pin, but there is a fuse already there for it in the main fuse box and it's hot at both sides, however if I remove the add on fuse, I lose 12V at the trailer. And my brake controller from my 98 plugged right in to the connector under the dash, have power to the controller, but none to the trailer brakes. Does this sound like someone just butchered the factory harness for some reason, or did they add the harness and make it that screwed up ??? It's so screwed up that it looks like it would be easier for me to buy a factory 7 pin harness and just start over. Any ideas would be appreciated.