It was my understanding that once the regulator has taken over it regulates the field control, so a resistor isn't needed.
The drill barely hit 14V which is sufficient, but I think as soon as I load up the battery (and thus the alternator), I'd need more pressure to keep the voltage/rpm high enough. I have no idea what the drill is rated at unfortunately. Perhaps a more heavy duty drill would be able to handle it, but I kinda doubt it. We need this turbine/pump/whatever to easily handle spinning up the alternator at no load conditions.
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