Quote:
Originally Posted by BRZnut
Usually with a bad battery once you get it started it will run until you turn it off and then not start again without a jump. The fact that yours dies while it is running sounds like a bad alternator. Any competent service center can check your charging system (battery and the alternator) and let you know what's wrong. But, since the problem started right after being at the dealer I would be inclined to take it back and say WTF!
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Quote:
Originally Posted by guybo
You can run all day with a bad battery and most likely you do have a bad battery [now], because your alternator is toast. When the alternator goes it often takes the battery out with it.
When your alternator is bad, it'll make it so the car dies while driving- a bad battery will not. The little check battery dummy light means the car is running off battery power because the charging system (alternator) has a problem. Check the connections on your alternator of course, but I think you're buying a battery and an alternator today.
Don't change the alternator and not the battery because a bad battery can also mess up an alternator. Think of them as one part.
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All depend upon what went wrong with the battery. The alternator may be fine. As per his description the battery didn't even last 7 minutes after being fully charged. That is a batter issue not an alternator one.
Now, the battery may have taken the alternator out already but he needs to try a battery before jumping into replacing the whole system.