It may not be the generator at fault, first thing to do is make sure all of the connections are clean and tight, then clean the contacts in the voltage regulator. Use clean white paper to clean the contacts, no abrasive sandpaper.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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