ALTERNATOR OUTPUT

Dana67Dart said

My recollection from years ago is that an alternator without a load can put out pretty high voltage like 70V there was a poplar science article, where they took an alternator and hooked it to a transformer and made 120v

Might have removed the diodes???

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No. When you unload an alternator and full field it, the voltage goes to the moon. There used to be these junk switch boxes you could buy to "provide 110v" (lie, the voltage was all over the place, and it was DC, not AC. ) What these boxes did was switch/ disconnect the battery, feed the alternator output to an outlet, and "full field" the thing.