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 - 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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