Here's the deal...I have a 2006 GT that just developed a dead battery while I'm at work. The headlight switch was in the 'off' position, yet the driver's side headlight is on and will not shut off. Neither the parking lights, tail lights, or passenger's side headlight is on. This has happened just once before, about 20 months ago, and after taking it to the Ford dealership they "weren't able to replicate the problem." Any clues? I'm at a loss.