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Some thinkin out loud. Tryin to remember my schoolin days. Generator output is # of poles x rpm's as I recall. So to go from 6 to 12, for a given rpm,you'd have to have another armature, or double the number of pole contacts at the brushes and wind accordingly. Don't know if that's practical; maybe so, never done it nor heard of it done. Obviously, the output is proportional to rpms so the higher they are the higher the output..... .not much output at idle like an alternator has. The smaller pulley uppin the rpm's would help. Think amps on old gennies of the day were around 25a as stated. But if it was 25 amps at 6 volts, yer ain't gonna get 25 amps at 12v. Course, amps squared x winding r = heat loss and to get twice the wire (to double the poles) in the same box would require smaller diameter wire. That's twice the power output for the same physical size and I'd bet heat would eat you up; heat of the losses in the gen. Course if VR is low doesn't matter, but is it the genny or the reg that's low? Mark
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