At least you have gained some further understanding in the method of operation of this system & you now know what the command signal looks like.
If you had more experience on this system you may have been confident enough to condemn the alternator from your test results.
Did you happen to note down the voltage when it was overcharging? I think this would also have given you a clue as to whether it was a control unit or a straight forward alternator fault.
My money is on the alternator running wild.
Good luck!
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