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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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