Does sound like a bad alterator. Probably the internal voltage regulator. Don't forget, alternators aren't battery charging systems. Once a battery dies, it loses 1/2 its life expectancy. If a cell is bad or dead, the battery is shot. You probable need both. Many automotive stores can bench test an altenator if you can take it off and bring it in to them.
Sounds like you need an alternator. Start the car and hook a volt meter to the battery. If it is not charging over 13.8 volts it's alternator time. Thanks....Dan
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My battery does not hold charge even with a new battery.
I have the same problem but I know the alternator's fine because it still runs when the battery's totally dead. It also randomly fixed itself for like three days after I accelerated hard.
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