I had an auto electric shop bench test my alternator. It seems the 55 amp Bosch will do that for a few minutes, but 30-35 amps constant load is all it can handle. I'm guessing the 90 amp can probably handle 50-60 amps continuously. Just something for people to keep in the back of their minds that output is rated at peak.
Great catch on the bad diodes! Good on you!