I think it's safe to say that an automotive generator of that era would be similar, but what you have to watch out for is 6 versus 12 volts. I'm not sure exactly when Detroit made the switch (I want to say it was in the 1950s), but they did it earlier than the tractors did. Meaning, a 1957 Ford car would likely be a 12 volt system, whereas a 1957 Ford gas tractor is still 6 volt.
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