sounds like an alternator. autozones alternator tester doesn't place enough load on the system to check for full amp delivery from the alternator. you really need one of the old carbon piles to diagnose it because it is like 170amp alternator or something ridiculous. it may just not be producing enough charge even though at low load its fine. my money is on it slowly starts to die faster and faster after each charge as the alternators regulator and diodes start to get worse.
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