The 10SI and 12SI is probably one of the easiest alternators to repair. No desoldering and no press-fit bearing in the back. Most common things to check or replace are the field brushes, the diode trio, and the regulator. All cheap. It's a 15 minute job to pull one apart and replace all I mentioned. Brushes come out the back without taking it apart at all. Regulator and diode trio are inside. Diode trio is easy to check with an ohm-meter.
10SI also has a regulator test/bypass port in the back. When running, you stick a small nail in the hole and see if it starts charging. If it does, it means the alternator is fine but the regulator is bad. That is why the test port is there. To ID a bad regulator. New reguator costs around $15.
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