You've replaced batteries, starter motors, and alternators, you say. What order did you replace them in? The problem you are having sounds like a battery, but if you had a bad alternator and a bad battery (simultaneously) and you replaced the alternator before the recharging the battery, you could have killed another alternator (they're not made to FULLY charge the battery).
A store like Autozone, O'Reilly's, or Advance, I believe, can test the alternator and battery for you, so you can remove them and take them in and see if either is bad.
You should also check that the ground strap on your car is fitted and in good order, if you still have problems after sorting the alt & battery out.
Kelly
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Wednesday, November 29th, 2006 AT 10:47 AM