I recently changed a dead battery for a new one. When I drove the car, no problem. But when I turned it off, the alternator light went on. Car was off but light was on, even if key was out. Light was not on when I was driving or idleing. I've read what the problem is if it is on when running or idleing, but what is the problem when the car is off? I have unhooked the battery now so that the warning light does not drain it. Any help would be greatly appreciated as I am a "newbie" and would hate to bring the car in to a mechanic if I can take care of this myself(Or at least know what I'm talking about if I do bring it in). Thanks in advance, Sean 1965 Mustang convertible Phoenician Yellow

I observed the same type of problem on an '88 Escort. It turned out the car had a bad/improper ground. If you go to http://forums.vintage-mustang.com/forums/ubbthreads.php?Cat=&PHPSESSID= they can probably answer your question better than I. This group of people have a lot of experience with Mustangs, as every single one of them either have, have had, or desire to have a classic Mustang. You are required to register, but registration is free. Good luck, --Jason