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Yikes...
I recommend taking it to one of those big-box auto parts stores like Auto Zone or Advance Auto: they'll test the charging system free of charge.
It could be the battery and/or the alternator.
The sound may be the added stress on the alternator to keep the charge up on a dead system. If it seizes, it would likely throw the belt or you'd hear the screeching of it slipping.
Not something I would wait to repair, IMHO...
RH77
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Supporting those devastated by the Joplin Tornado
EF5 / 22-May-2011
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