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Here is something for further testing: In order to test an alternator's minimum charging voltage point, we would install a 1/4 ohm resistor in the main charging lead to the battery to get the regulator to drop to minimum output. The 1/4 ohm resistor raised the batteries visible impedance to the regulator, causing it to drop to minimum output.
What you are describing does sounds like the minimum output for that alternator.
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