Maybe I can help here because I went through this a few times and it finally stuck. Someone please correct me if it's wrong.
In an A circuit the field is internally energized by having one end connected to the ungrounded brush with the other end to the F terminal. The ungrounded brush connects to the A terminal. The output is controlled by grounding the F terminal through the regulator.
In a B circuit the field is internally grounded (to the grounded brush or the case) with the other end connected to the F terminal and energized from the regulator.
So, in an A regulator the F tab is a path to ground. In a B it's a path from the battery.
Polarizing requires different methods but I've never had to do a B so I can't splain that. Hope this helps.
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