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It is possible to obtain higher voltages from an automotive alternator. Try to find one that uses an external regulator. I got 80 volts from a late 80's- early 90's unregulated Chrysler alternator coupled to a 3000 rpm ac motor with 12 volts applied to the field coil of the alternator. I set this up on my workbench and connected the alternator's output to 5 discharged 12 volt batteries. This caused considerable drag on the alternator and ac motor. So some braking should occur. Don't yet know what running this for an extended period of time would do to the rectifying diodes.
 
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