From your last reply below, I see the following possible reality. The cutout relay is not doing its job in the VR. If it is not, the generator will discharge radically through the amp gauge to the gen. The generator and Battery are always fighting each other for voltage supremacy. If the Cutout relay is letting the generator stay connected, even when it is turning slowly enough not to charge the battery, it will do as you indicate is happening. Another factor is that the generator from a baler may be limited to only a few amps charge rate because it has no lights and runs long spells between start cycles. My suggestion might sound wierd, but try it if you can! Find a junk alternator and take the main diode bridge out of it (the big diodes) they will come in two sets of three. One will pass current lead to base, the other base to lead. Use one of these diodes (in the set or seperated) to replace the cutout relay. Disconnect the VR from the Bat terminal, and Gen terminal (leave the field connected. Connect the battery lead wire to one diode lead, and the Arm lead from the Gen to the other.
This prevents discharge into the generator (if it sparked, it is the wrong set of diodes, use the other one) No way can it now discharge. Now run the engine at high speed and see what happens. It may just work!
If your generator and regulator is really a three brush unit, the thing you call a regulator might be a cutout and field resistance unit only. Not a true regulator. If it has only one coil and contact set in it, it is not a regulator, and it is not doing its job. New fangled really good cutout relays have a diode inside instead of the coil and contacts, so my method is not out of line. If it will not charge now, ground that field terminal and try it at high speed. If it just charges a little, you have a low output generator, not a good choice for a tractor. If it is a three brush, adjust the movable brush close to the stationary brush and see if it charges more. I would replace them both if it will not charge much, and only then put a real regulator on it if it does. Not a cutout relay) Let us know what you find. Remember good looks often can get a person in trouble. Function is a premium. JimN
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