Posted by pete 23 on September 23, 2017 at 18:17:59 from (173.86.91.69):
In Reply to: nuther gen question posted by 55 50 Ron on September 23, 2017 at 16:33:16:
Many a 3 brush generator is equipped with a regulator. IH switched to voltage regulators on their Farmall tractors in about 1950. All H and M's up through the 450 used a 3 brush generator. It was somewhere in that time frame of the 450 where all replacement and original equipment generators were switched to shunt wound (2 brush) as I installed a few when original generator was beyond repair. All 560 etc were two brush and from then on up. I will add that a different field coil was used with the regulated generators than the generators controlled with a high low charge switch. The ones with regulators had less current flow through the fields. That is a problem with a lot of rebuilt units as they go by one size fits all. I will add that the two unit voltage regulators are a combination current and voltage regulator. Thus they use a fourth terminal for light load so that portion of the charge is not subject to the current regulation portion of the regulator. Not a good system as even a Delco Remy representative confessed at a service conference once upon a time. It wasn't until the 06 series IH tractors that they started to use the three unit regulator which was far better. It had been used on Motor trucks and automobiles for many years.
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