Quote
I think your problems were a sign of a diode or three going bad in the alternator.


My FSM electrical shows 3 diodes in the alternator within the rectifier assembly. To test you'd need to get at the rectifier to test continuity or (as it says) use a waveform analyzer. I don't know if you can just replace the rectifier, or if that would be worth doing.

92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles