I will wade in! There are no "B" type IH tractors that I am aware of. "B" generators are found on some Fords and other brands of charging systems. "B" generators have power from the regulator to the field, then to an internal ground in the gen. "A" type systems ground the field at the regulator, and get voltage from either the third brush, or the Arm terminal leading to the hot brush to make the field current.
My ideas may sound weird, but they are harmless. With the battery charged, turn on the lights. (if it has none, connect up a head lamp or bulb from any headlamp, even 12volt, to some jumper wires. with the tractor stopped, touch one headlight test light lead to ground, and the other to the Bat wire on the VR. Watch the amp meter. If it goes positive, toward the charge side, you now know that the amp gauge is in backwards. If it discharges, it is in correctly. if it does not light, the wiring from the Bat terminal on the VR to the amp gauge, is broken. (not likely) If it moves to the charge side, reverse the wires on the amp gauge. If it moves to the discharge side, the amp gauge is reading correctly. Assuming the gauge is correct, there is one check I need to have made, that is to place the volt meter on the battery terminals (needs to be an analog meter with a needle!!) and check the voltage there as it is started and run at differing RPMs. If the voltages are less then 6v, I suspect the regulator is not good. If the F terminal is grounded, apply the same meter connections and give us the report at various engine speeds. A digital meter is great for new applications, but usually samples instantaneous voltages that give false true averages. Jim
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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