My driver side low beam bulb blew out a few week ago. Upon having the bulb replaced I was notified that the wiring was bad and that the whole headlight needed to be replaced. I purchased a used head light from an auto parts shop and the low beam still doesn't work (I even tried a new bulb, still nothing). I'm thinking maybe its the fuse but wouldn't a blown fuse cause both low beams to not work as opposed to just one? What could the problem be?