I'd think that if the alternator were the issue, you'd see some kind of red battery / alternator light coming on. This would tell you that the battery has more voltage than the alternator is putting out. If you turn the ignition on but don't start the vehicle, it should illuminate... good way to make sure the bulb is good. Parasitic draw would only kill the battery while sitting overnight or a long period of inactivity, so I doubt that's the issue. One or two dead cells in the battery might be the issue if the alternator checks out ok.
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