An unregulated automotive alternator will put out hundreds of
5 or 6 years ago, I had a bulkhead connection get rotten from age
on my 70 'cuda, voltage at the battery was 12.6, voltage at the
alternator output terminal was over 300 volts.
I don't remember exactly what the spec was but the voltage fed to
the electrically heated windshields in full sized Fords and
Mercurys was in the hundreds of volts category.
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