Those systems can be complicated and cantankerous to keep working.
If yours is working, and charging at the correct voltage, count your blessings and LEAVE IT ALONE!!!
But if you want to tinker with it, take pictures, make notes, measure every step, so you can return to where you started if need arises!
Some things to keep in mind, if it does have a regulator (not just a cutout) do everything you can to save it! New aftermarkets are near worthless, nothing like the originals that had high grade expensive alloys in the contacts, and were carefully fit to the exact specs of the generator output.
When adjusting a regulator, the cover needs to be sat back on after any adjustment, it will change the settings, messes with the magnetic field somehow. If you make adjustments to the regulator, you will need a quality analog volt meter, like a Simpson, not a Chinese pocket meter!
If it has only a cutout, there is a solid state diode type that replaces it. Never tried one but the theory makes sense.
Here is some information on 3rd brush generator systems and generators in general.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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