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Harold, Basically a Generator doesnt know what its output should be, its increaded EITHER by spinng it faster ORRRRR RR passing more current through its Field windings which increases the electromagnetic field strength resulting in more output, which (regulating field current) is a function of the Voltage Regulator. I have used 6 volt gennys to successfully charge a 12 volt system SIMPLY by changing to a 12 volt Voltage Regulator, and they worked not a problem BUTTTTT TTTT they didnt set the world on fire and didnt produce very high charging amps, buttttt t they did work and kept the battery charged. THAT BEING SAID its NOT the best or engineering correct or proper way to do things, IM ONLY SAYING IT CAN WORK!!!!! !!!!! !!!!! if used long n hot n hard enough and subjected to high amp charging charging requirements causing it to overcurrent and/or overheat, things could eventually go sour, but if light charge rates are required it could last a long time, mine never went bad. An old fashioned genny n starter repair shop (if any still exist near you) could convert the 6 volt genny to 12 volt by changing the field coils and change out the armature if required as the commutator segments and spacing can be different. The other option is to simply buy a used or rebuilt 12 volt genny n be dome with it or as mentioned above have a shop convert yours to 12 volts in an engineering correct procedure. BOTTOM LINE YESSSSS it can charge at 12 simply by changing to a 12 volt VR,,,,, ,,,,, BUT its not engineering correct and may work a long time or a short time depending on the battery and load and conditions..... John T
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