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One item to add...if you have the time.
Once you have your alternator out, go have it tested. In many cases, the failing piece is the voltage regulator, which bolts to the back of the alternator. An auto parts store test will tell you if you have a bad diode (internal to the regulator) or a problem with the alternator itself.
If you have a bad VR, its easy to replace with a ~$50 Bosch unit.
I went this route almost three years and 20K miles ago. So far, so good.
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