In this particular application all you need is a diode in parallel with the generator field with its cathode toward the positive terminal. The diode should be rated for the full field current. The diode will be reverse-biased when the VR is energizing the field. When the VR contact opens the field current will flow through the diode, decaying at the field's LR time constant. There will be little arcing because the voltage across the contact won't exceed battery voltage.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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