It may not be the regulator. I have had problems with the connector on the regulator. Some times you can take it off, crimp the connectors tighter, and put it back on. Then things work fine. It is also advisable to add a little grease to the connector to prevent rust of the connection.
However, I wanted more power, so I changed to a modern Ford internal regulator type alternator from a minivan. 95 amps and works great. It is a direct bolt in and only requires adding two wires to bypass the regulator.
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