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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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