I have a '97 dually. It has a brake controller that was there when I bought it, but it doesn't work. There's a 6-pin in the bed that was used with a gooseneck, and I've replaced the 6-pin on the rear bumper with a 7-blade to match my trailer. The wiring in the back is not very well done (I was surprised when I wired up the new connector and all the lights actually worked), so I'm going to rewire the trailer brakes and redo the rat's nest of wiring for the lights. I'm planning to put a Tekonsha P3 from my (soon to be sold) '03 Suburban into the dually, and I'm looking for the best way to run new wires from the cab, to the engine compartment, and back to the connectors. Any suggestions - wire types, routing, best places to tie in to the existing harness? Also, since I've never towed a gooseneck trailer, I'm wondering if the 6-pin round connector in the bed is standard for those. I'll keep the connector in the bed if it's likely to fit a gooseneck - I don't know when I'll ever tow one, but no sense deleting the connector as long as the truck has the hitch. If I'm better off with a 7-blade connector in the bed, though, now would be a good time to switch while I'm already crawling under the truck with wiring tools.