Not impossible to measure, but difficult to calculate from ohm measurements. Generators in operation (I will use a Delco "A" circuit 2 brush example) have the voltage applied to the source at the Armature terminal. For the field circuit is going to be 7.2 volts. This is the operating, charging voltage of the output into a battery being charged at the generators max output. The current through the field windings will be considered to be directly to ground. (full fielded) the magnetic fields produced in the fields interact reactively to the current generated in the armature (Back EMF) this loads the field with a dynamic increase in current, that varies with speed, and the efficiency of the generator (magnetic coupling between the rotating and fixed components). So rather than get all scientific and radically complex. just put a good amp meter on the field wire and measure it under some variable conditions. Jim
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Today's Featured Article - Restoring a John Deere 2010 Diesel Tractor - by Jim Nielsen. Following seven years working in California's Silicon Valley, my wife, baby son and I moved back to Australia to retire. We bought a small 'farm' of about 50 acres near Bendigo, in the state of Victoria. I soon found that it would be very useful to have a tractor around the place for things such as grading our long drive and brush-hogging the fields. I was also embarking on planting 1000 eucalyptus trees, and hence I would need a ripper, small disk plow, sprayer etc. to get these things accompli
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