"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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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