About the only thing I got like that on my 99 goes up to the switch on the parking brake mechanism. If you look up there... there should be a copper blade where that connector goes to. Slides on. Its right by a little spring where the pedal hinges on the mechanism. I didn't really pay any attention if it was a ground or a hot wire. I would imagine its for the dash cluster light when the brake is applied. Does your dash light up when the brake is on?