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Alternator does not charge on a hot day

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Old 10-01-2011, 06:44 PM
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Alternator does not charge on a hot day

Any ideas,

Seems that my alternator doesn't like to charge the system when its over 90 deg..

Battery is only a month or so old.. and the alternator is hi-amp 160, about a year old..
Old 10-01-2011, 06:45 PM
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alternator getting too hot, causing brushes to not interact?
Old 10-01-2011, 06:55 PM
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sounds like a good theory, guess I'll need to take it out to check
Old 10-01-2011, 07:08 PM
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Dunno, i'm not a huge electrical buff, but i know that electrical motors get too hot and stop working, so maybe find a way to get the temp of the alt?
Old 10-01-2011, 07:41 PM
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I do have a pyrometer..

ordering new brushes and holder from Napa
Old 10-03-2011, 06:41 AM
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I take it back... didn't charge on the way to work this morning after tightening the alt belt lastnight..
Old 10-03-2011, 03:37 PM
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A. Go get your system tested (i.e. Autozone, etc.)
B. Do you have really hot days now? Running the A/C? I've seen plenty of our fleet vehicles this summer killing their charging system while drawing power while runing the A/C at the same time.
Old 10-04-2011, 06:35 AM
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The alt works most of the time, some times the volt meter will drop to the halfway mark, then later decide to go up to the 18 volt mark..

when it clicks on its fine..
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