Why does my car battery die overnight and battery light turns on while driving?

1998 DODGE INTREPID
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BUCS963
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I replaced the alternator and tested good. New Battery tested good. When I drive the battery light comes on when left connected battery dies within a few hours. What could be causing the battery light coming on while driving and the battery dying all the time.
Dec 6, 2011 at 10:09 PM
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RASMATAZ
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The computer controlled of the alternator
Dec 6, 2011 at 10:19 PM