Dealer was useless. The brake switch has 5 wires, there are 3 smaller gauge wires that I don't know what they do, the 2 larger gauge wires seem to be the brake switch. The outboard one is hot (red white) and the one next to it (purple white) is the one I wanted. The leads are so short I was unable to get a piggyback connector in and I ended up scraping the insulation and just splicing to the bare wire and wrapping it with tape. I will probably do a better connection later. The controller mounted nicely in a cutout in the console.
There is another switch attached to the brake pedal which is not the brake switch. It has 2 wires which neither are hot (I think it may be cruise control kick off)
All in all it took me 4 hours to install the whole thing. If I could see what I was doing it might have been faster. I would have taken it to the dealer but I have giving them my money.
