my car wont start without a jump start

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WARNERKEVIN
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The man at autozone said my battery was fully charged. and my car runs after the jump without the battery connected. what could be the issue?

it started from a light being left on for at least 6 hours. i got a jump start to get home.. i took the battery to autozone and was told it was 100% charged and it could possibly be the alternator. however i got a jumpstart and when my truck was running i disconnected the battery and it stayed running
Nov 18, 2011 at 5:30 PM
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JDL
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If the battery is fully charged, there shouldn't be a problem with alternator. With the vehicle electronics, engine running, it's not a good idea to disconnect battery. If your saying the vehicle won't crank without a jump, check voltage at starter circuit, no jumper. Any testing, make sure the tranny is in park or neutral and the e-brake is set.
Nov 18, 2011 at 5:57 PM
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WARNERKEVIN
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well when i drive after im being jump started, the batrtery gauge jumps up and the check gauge light comes on. i just got off the phone and the man at auto zone suggested that the alternator was overcharging the battery
Nov 18, 2011 at 7:20 PM
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JDL
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Use a digital multimeter across battery posts, everything off, take a reading. You said they checked your battery was it overcharged? I want to see the voltage reading.
Nov 18, 2011 at 7:44 PM