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Is the battery/alt warning light on? if they didn't disconnect the battery while the starter was being replaced and they accidently shorted the battery cable out it could have damaged the regulator of the alternator some of the Delphi regulators are very sensitive to that, but if it tested normal at the parts place, does it run down while driving or while sitting?

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Q: Replaced the starter on a 1999 Alero now the alternator does not work Alternator was fine when checked out at the parts place but battery still runs down on the car New battery too?
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