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Battery or Alternator?

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Old Nov 5, 2007 | 08:05 PM
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Default Battery or Alternator?

Car died at the shop today while getting an oil change. How do I tell if its the battery or alternator or BOTH that are bad?

Thanks!!!!

David
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Old Nov 5, 2007 | 08:07 PM
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check and clean your contacts....clean the main ground wire to the frame......

you'll need to run a check to see if you have a draw to see if you have a short

b
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Old Nov 5, 2007 | 08:28 PM
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Very unlikely that both are shot at the same time! Need a voltmeter to check battery and alternator output separately.
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Old Nov 5, 2007 | 08:29 PM
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Putting a slow charge on it right now.

It gives a few turns and then starts...noticed as I was driving home (on a jump) that the interior lights were dim and the turning signal was slowwww....
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Old Nov 5, 2007 | 09:24 PM
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a down and dirty way to check the alternator is to start the car, hold a screwdriver to the very center of the back of the alternator if it is moderatly strong magnetic then it is probably good, also crank the motor then unhook the ground cable from battery with it running if it is bad it will usually die as soon as you unhook it......or take it off and take it somewhere have them check it..............
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Old Nov 5, 2007 | 10:39 PM
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Disconnecting negative cable while running,is not a good idea.
Quick check.
With engine off check battery voltage.
With engine running should be about one more volt.
If not its the alternator.
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