[Cobra20646]

Like Bill said, it could just be an unused wire. First thing to do is check to see if it has voltage on it. If it's not going anywhere, it shouldn't have voltage on it, but that's no always the case.

Connect a volt meter between the wire and chassis ground. Then start the engine, turn all the dash switches on and off, blow the horn, until you see voltage on the meter. Depending on your fuse box, you may have to stick a fuse in where none are to see if that's where the other end of the wire is. Chance are you'll find it. But if you don't, find a friend in the telephone business.... they have a gizmo that connects to one end of a wire and sends a signal to a hand held receiver..... they can run it alone the car and follow the signal to where ever the wire goes.