With the engine running and up to speed (not idling), the regulator wire disconnected, check the F terminal with a test light or voltmeter to ground.
If you get a voltage reading, it is a type A. Ground the F terminal, it should full charge.
If there is no voltage, it is a type B. Jump from the non grounded side of the battery, it should full charge.
It won't hurt to experiment, get it wrong it just does nothing. Just don't experiment with the regulator connected.
As for determining the regulator, you can take the cover off and trace the circuitry, see where the path of the F circuit goes.
If it goes to ground, its an A, if it goes to the battery, it's a B.
Usually the problem with a regulator is the field contacts are worn or dirty, may just need filing. The contacts are held closed by a spring, so at rest there should be continuity through the contacts.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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