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mgreen ... 5/23/2013

2002 Ford Windstar LX 6 Cyl 3.80L

Preventive Maintenance

battery drains overnight

only happens when the care is off overnight

1 Answer


Jimm 5/23/2013

If you haven't had a load test done on your charging system, With a Voltmeter and engine running - set meter to DC volts and read across the battery terminals. It should read 13.5-14.5 volts. If below this then suspect your alternator, or belt drive tensioner, or slipping drive belt.
If these items test OK - then I would assume a parasitic electrical drain - for example, one of the interior lights is on when it should be off. A trunk light maybe or a short somewhere. Something is not turning off when it should.


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