I'm looking for help connecting my brake controller in my 97 Yukon. What wire do I tap into for the brake "signal" (turns on when I apply the brakes)? I tapped into the brake switch on my 88 suburban, but I can't even see a brake switch on the Yukon. The dealer has a pigtail, but it only works on the newer body (2000 up). Pictures of this body style and brake controller wiring would be helpful. Thanks for any help.