Ford dynamo

[T Creighton]

Hello Richard,
I have scanned a page from an ancient Dykes Automobile Encyclopedia under Model A Ford wiring. The picture of the generator and cut out in this book looks the same as the one you have posted. Ford didn't change things much so it might apply in your case.
Hope it is of some use.
If you have a third brush current control there will be no regulator box (as in later models) only the cut out.
I once had a 1936 Chev car with third brush genny and an auto electrican converted it to a two brush system and fitted a current/ voltage regulator . Worked well and fixed all the flat battery problems
Cheers, T