An open circuit in the sensing circuit can "fry" the diodes. Removing a battery cable while the engine is running creates the same problem and the same results. The sensing or feedback circuit "reads" the output voltage of the alternator. An open circuit means that the sensing circuit reads "zero" and the built-in regulator boosts output voltage to try to get the proper voltage at the sensing terminal. The voltage in such instances can easily climb to over 120. Check your wiring carefully, in every detail.
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