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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