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Can a failing alternator or voltage regulator drain battery even when ignition is off on our 1989 Ford Aerostar?
Wiki User
∙ 15y ago
I have had 4 Aerostars all together and here is my guess to your problem. I had some problems with battery corrosion that caused the battery not to charge, be sure to clean both terminals good even if they look ok. That was my problem and it happened to me several times. I also had a bad starter that would drain the battery real fast It sounded like the battery was getting weak, I replaced the battery but finally the stater failed after a month or so. Make sure the fan belt is not loose. Try to check and make sure no accessories are on, like dome lights caused by a bad door switch. I have also seen home install on stereos that connect to the battery instead of the accessory's side of the fuse block. So the stereo gets left on, low volume of course and drains the battery over night. Hope this helps... :) yes, your clock on the radio, and some sensors still are running after you shut the key off.
Wiki User
∙ 15y ago
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