In a "A" circuit system, the field is externally grounded by the VR or Charge control switch. It gets its power from attachment to the arm (hot) brush inside the gen, or from a third brush picking up electricity (a little remotely) from the commutator segments. Thus when the bat to gen (or arm) jumper is used the field gets current through their windings. This creates residual magnetism in the iron of the field poles.
In a "B" circuit system, the field is grounded inside the generator directly to the case. The field terminal is provided with voltage from the regulation system (not grounded at all). Thus polarizing a B circuit requires flashing the Bat to the F terminal. Momentarily energizing the Field coils to make residual magnetism of the correct magnetic polarity.
Polarizing improperly can and will ruin regulator control components, or not do anything. Jim
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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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