Quoting Removed, click Modern View to seeThe reason the light comes on is that the cut out contacts open (the set I believe that you are calling the 'current reg coil'). Why are they opening? Could be insufficient gen output at lower speeds, caused by generator problem, wiring/connections, or the field control may be reducing field current enough to cause cut out to open, which again could be wiring/connections or maybe bad VR field circuits/contacts.
May very well not be a VR problem. Voltage readings at various rpms may be informative. If you temporarily jumper Field to Armature, this will force generator to output its maximum & observations at this time may be helpful. Don't do this for more than 10-15 minutes, because if gen is working well, it may overcharge battery & heat gen a lot.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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