"Do you think it would be safe to conclude that the proper sized ballast can be determined with an ammeter, instead of measuring it's resistance, 4 amps when it's powered up? "
I don't have a problem with the use of a good analog ammeter myself. An "ideal" (none such made however) has zero resistance so as to NOT affect the reading. The critical limiting factor (to prevent premature points failure) in a typical old tractor coil ignition is how much current the points can pass and switch so if you get that in the 4 amp range and provided 4 amps is a sufficient coil current I say compute the ballast resistance by that method makes sense. That's where they get the typical 3 ohms vicinity for 12 volt coils and 1.5 for 6 volt coils as that yields the 4 amps of points current. NOTE these are not all exact figures, I've seen stock 12 volt coils from 2.5 to 3.5 ohms.
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Today's Featured Article - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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