Charging system not working.

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Alternator is charging at 11 volts when connected to the car. The car dies as soon as I disconnect the battery to run solely on the alternator. When I removed the alternator, it put out 16 volts. Also, when left sitting over night the battery will drain. The engine is the 6 cylinder 3.0L and the alternator is the Bosch with a six groove pulley.