Question about 2002 Ford Taurus

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Cars electrical system goes completly offline, nothing will illuminate or work until I disconnect the battery. When I turn the key to start the car everything shuts down again. Has anyone heard of this before? What can I do?

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It sounds like a Body ground problem or a shorted Battery. Try using jumper cables and connect the NEG jumper cable to a body part on the Firewall. Then see if the lights and accessories work. You can leave the Battery cables in place. If the lights work, see if the car starts.

Dirty Battery cables can also cause this problem. So can a shorted Battery, though I would think a lightbulb would work with even a shorted Battery. Everytime you disconnect the Battery you are making a new connection when you reconnect the cables. The ends should be shiny not black.

You can eliminate the shorted Battery by disconnecting your Battery cables and use the jumper cables to bypass the Battery and use another vehicle to run yours via the jumper cables. They you will know if the Battery is shorted.

Autozone and Oreillys do free tests on Batteries and will scan your car for free if you can get it there.

Posted on Sep 10, 2010

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