Ron, I would have to go through all my archives to be 100% sure BUT I think towards the end of the 3 brush genny era they were using full fledged voltage regulators on some 3 brush gennys. Of course in the beginning it was the three brush where you manually had to set the light switch for Low or High charge while the two brush and VR's was the new n improved method. I think if I were going to use a VR on an old 3 brush genny, I would adjust the third brush (if its adjustable) to the max charge condition as close as permissible to the fixed main non grounded brush and then if matched let the VR do its job of regulation. The VR's field current control relay and its onboard fixed wirewound resistor is supposed to set there and switch and chatter to control the gennys output versus the batterys state of charge and its supposed to be designed with the current ratings of the field windings in mind so as to NOT overheat them. However several 6 or 12 volt gennys had close to the same field winding ratings so perhaps different if still close VR's would still work even if not perfect.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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