1991 Mitsubishi Galant Alternator problem

1991 MITSUBISHI GALANT
135,000 MILES • 4 CYL • FWD • AUTOMATIC
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AUTOMOM4
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My son just bought a used 1991 Mitsubishi Galant GS/GSR. The seller said it needed a new alternator. He had the old one checked and it was bad--so he replaced it. When he disconnects the battery cable, the car dies--had the new alternator tested (just in case) and it is good. Tried different battery and same thing. Whay else could be wrong?
Sep 19, 2009 at 3:10 PM
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DOCFIXIT
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Does alt charge battery stayup?
Sep 19, 2009 at 3:31 PM
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AUTOMOM4
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[quote:485228bd86="Docfixit"]Does alt charge battery stayup?[/quote:485228bd86]

no -- the battery runs down
Sep 20, 2009 at 5:33 PM
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DOCFIXIT
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May have a battery drain will need a Volt Ohm Meter.
Do you have one?
Sep 22, 2009 at 10:19 AM
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AUTOMOM4
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[quote:8c08c33cd8="Docfixit"]May have a battery drain will need a Volt Ohm Meter.
Do you have one?[/quote:8c08c33cd8]

no, but we've tried other batteries with the same result
Sep 22, 2009 at 10:55 AM