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My 9R started having issues keeping up with current draw about a month ago. I tested and found that the system voltage was dropping to 11.5 volts @ 4000 RPM when all my accessories were turned on full blast. In the past, it was always able to keep up. With no extra load, it was able to maintain 14.4 volts.
I tested the output of the charging coils and found them fine. They also had good resistance and no shorts. Since the voltage was OK with little load, I figure the regulator/rectifier would be OK, but decided to test it anyway. It took tremendous effort pull the three phase AC input plug apart on the regulator. When I was finally able to get it apart, this is what I saw: The connections must've become a bit loose and the increased resistance generated heat and melted the two halves of the connector together.
I bypassed the plug temporarily and it works perfectly again. New connectors have been ordered.