Quoting Removed, click Modern View to seeWell, like most things in life......it depends. I don't know what specific gen & VR is in question here.. If 9N.2N with cut out, there is no voltage regulator, and output will go up into region of 20 volts and if run there long, the generator will get very hot as the Field is fed from inside the generator from its armature. Normal field current may be around 4 -5 amps. If output voltage doubles, field current doubles. Power (heat) goes up by the square of current, therefore think 4X normal or instead of 37 Watts, it may see 150 Watts! I expect that to be a problem after awhile. If newer system with a voltage regulator controlling field current, then IF all is functioning as normal, the VR will regulate the output to normal voltages. However, when unloaded, that VR is trying to control a generator capable of outputting several times normal voltage and my question would be, does it have the range capable of doing so? The mechanical VR controls by switching field current on-off-on at a rapid rate & for varying percentage of time to maintain an average output of a bit over 6 or 12 volts. This might look like 10v on for 60% of time and off 40%. However, of no load it may look like 18v on for 30% and off for 70%. Does VR have this range? Can its contacts tolerate switching the 3X current? Experience says, probably yes for at least a short period of time, but I have never tried to run like that & have never set up meters & oscilloscope to observe precisely what is going on under such circumstances. I don't think I would risk my own good working system to do this experiment. Maybe someone else's? As John said, battery cables have been momentarily disconnected for seconds many times in the past without known damage. Some of my thoughts & perhaps & maybes, etc.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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