[Model A Speedster]

This is a very interesting thread! I'm running 6V alternators on 3 of my A's with no problems. Two of the A's have sealed beam headlights and it's nice to be able to honk your horn and have the lights on at the same time. (That problem - thanks to this thread - may be due to lousy ground paths.) I would recommend that for a driving car you have an alternator. Just my two cents worth...