You can just put in 12 volt bulbs to cure the lighting question.
They usually stamp the volt rating on the under side of voltage regulators and wether it's a neg or pos ground regulator.
Your A most likely has a magneto for an ignition system so no need to worry about that.
Don't run the charging system with the battery disconnected, you will burn out all the bulbs even if they are 12 volts. The battery needs to be in the circuit while the generator is running. The battery is a load that the regulator senses and adjusts the voltage output accordingly. If the battery is not in the circuit the regulator senses high resistance and tells the generator to over come the high resistance by raising the voltage.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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