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Re: 2 Questions..
The alternator does a pretty darn good job of properly charging it. The old style potentiometer style regulators were pretty effective, but today's cars are controlled by very sophisticated internal regulators that do an excellent job. The alternators today for the most part are more than adequate for whatever you throw at them, and the regulator is very good at determining how much juice goes out to the battery and system depending on what draws are on and the condition of the battery.
Suffice it to say that if everything is working properly, its a no-brainer.
I have a 96 Impala SS with a 140-amp alternator and I've run some low-power amps since new. Its now almost 9 years old with 88,000 miles and I just replaced the original battery two years ago... and thats mostly because I felt like it was "time" not because it failed. That's not typical, but it is possible with today's electronics.
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Dragging people kicking and screaming into the enlightenment.
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