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Bill, Basically a genny dont necessarily know what voltage is SUPPOSED TO GENERATE, its increased by: 1) Turning it faster, or 2) Pumping more amps through its Field windings which increases the magnetic field strength in which the armature rotates. Its the regulation/control of the Field amps what controls/regulates the gennys output regardless if automatically by a Voltage Regulator or manually by a Low/High charge type light switch, they dead ground the Field post for High Charge but ground it via a resistor to lower field amps for Low Charge THAT BEING SAID YESSSSS SSSSS I have used so called "6 volt" gennys totally unmodified to charge a 12 volt battery simply by changing to a 12 volt Voltage Regulator BUTTTTT TTT IM NOT SAYING THATS IDEAL OR CORRECT OR PERFECT OR BEST MIND YOU, ONLY THAT IT WORKS. However, it didnt set the world on fire or charge at any high amp charge rate, buttttt it did charge with no problems. TO DO IT RIGHT, it would be converted with new 12 volt field windings and the armatures N COMMUTATORS are a tad different which a regular old fashioned type genny shop could perform and replace alllll in the same original core NOT A PROBLEM In the event the gennys is a 3 brush adjustable type, it would help to set the third brush for the MAX charge rate for sure. BOTTOM LINE yesssss sss it can charge at 12 volts (genny unmodified) but it wont charge at the rate a designed for 12 volt genny normally would. Hope this helps n answers your question.... John T
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