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Can a bad alternator run a battery down?

I came out from work this afternoon to a dead battery in my '99 Taurus. I saw nothing left turned on. I got a jump and went to Autozone two miles away. By that time there was enough charge to restart the car. My battery checked good, but they said the car had a 4-1/2 amp draw when it was shut off. The alternator still put out over 60 amps when reved up. That's good.



Can a bad alternator on a modern car run the battery down? I know the old ones did sometimes, but I thought they "fixed" that aspect of them several years ago.
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