Every 6 or 12V Delco I have ever seen was type A. Every 6V Autolite I have ever been around was type B. I have seen a type A Autolite that was 12V. Both control output via the field. The differance being a type A always has full voltage feeding the field and controls output via the ground while a type B field is always grounded and the control is via the input voltage. Your information is valuable as the number of people who understand these systems shrinks daily and a whole lot of well intended guesses are wrong. Thus we have major sales of one wire alternators. Luckily I was schooled in them and manage to keep all of my stuff original and properly operating.
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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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