Are battery contacts clean and tight? Take terminals off the battery, clean them well and see if this makes a difference. They may look clean from the outside, but it's the contact they make to the battery posts which make all the difference.
If yes, I believe there is a "Main Relay" which provides power to most functions in the electrical circuits. If this Main Relay is bad, it can result in a dead car as you describe.
Friday, February 27th, 2009 AT 10:02 PM