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Ian, if youre reallyyyyy yyyyy yyyy sure you have this urgent pressing need to convert to 12 voltd, I can help ya I reckon, but under protest lol. Get a 12 volt battery, of course and I would stay at the same polarity as you are now. The usual reason for changing to neg ground is when you change from a Gen to an alternator. 1) Okay,,,,, this IS NOT POLITICALLY OR ELECTRICALLY CORRECT but I have used 12 volt Voltage Regulators on 6 volt Generators n they all worked fine to charge 12 volts PROVIDED you dont have any huge lighting loads. However, the electrically correct answer is to get a 12 volt generator or else have yours converted to 12 by a good old fashioned generator repair shop. Be sure the new VR is the correct voltage and compatible with your ground, be it Pos or Neg.... 2) Change any light bulbs to 12 volts 3) EITHER add a series voltage dropping (12 to 6) Ballast resistor in the Igniton circuit after the ignition switch and before the coil if you use the old 6 votl coil ORRRRR RRR replace the coil with a full rated true 12 volt coil. The Ballast Resistors are around 1.5 to 1.85 ohms and 30 watts or so and readily available. 4) I have NEVER changed a starter when I converted, although it can be a tad rough on the bendix n starter drive when you use 12 on a 6 Suppers ready, I may have forgot something but Im hungry lol,\ John T
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