Sounds like it. If it doesn't charge at all, or has consistent low voltage, then the brushes are bad. When its all over the place, the diodes are generally bad.
0110-M-P- What year, make, model Subaru?
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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