Most parts stores have the ability to bench test alternators, whether or not this test can be done with your application, I don't know but it's worth a shot.
My guess is the regulator but I'm not familiar with the first gens and their parts.
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1993 Yamaha GTS1000
1992 Celica Turbo AllTrac
1987 RX7 Sport
1979 Yamaha G1, KM24 powered
1975 Dolmar KMS4
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