Check to make sure you have power to all three terminals with the switch on and no power to #1 with the switch off.
With 12 volts applied to the #1 terminal the 10SI should begin to charge at 500 - 700 RPM. That is alternator speed which is about 2 1/2 times faster than engine speed.
If you have power at all three terminals and it is not charging the problem is in the alternator. You can try grounding the little tab inside the D shaped hole to the case. That takes the regulator out of the circuit.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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