At some point earlier in its life the original cutout was replaced with a voltage regulator. So presuming the VR is wired correctly the light switch "L" and "H" positions are now simply two alternate "off" positions for the lights. Thus the switch setting now has no effect the charge rate - that's now for the to the VR to perform.
You might try printing the generator/regulator troubleshooting chart (link below) then following it through to identify the problem.
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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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