That voltage sounds low to me. I would expect it to be charging at 13vdc or more even at idle. That being said, are you sure your battery is OK?
I'd be curious to see battery voltage after bench charging, the same after charging and sitting all night, and the same after charging and sitting in the car all night. Using a multimeter.
It seems like the alternator is the culprit, though, given the voltages.
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