So i left my 89 GT overnight. it ran beautifully the night before. I get in to go to work... nothing. no electricals no turn over no click nothing. silence. I have no idea what was wrong or even where to start. Obvious first guess is the battery. i tried to jump it and still nothing. like its not even connected to the other cars battery. i put the key in the on position and still not even electricals. I really have no idea where to even start. any help will be greatly appreciated. thanks guys.