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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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