Over many years (used tractor dealer & farmer) I have seen them in the 2.5 to near 4 ohm range, while a typical value would be around 3 ohms LV Primary resistance on a true 12 volt coil.
NOTE A Coil labeled 12 Volts for use with external ballast is in reality more like a 6 volt coil and indeed needs the series external voltage dropping (12 down to 6) ballast resistor or it will overheat. A coil labeled 12 volts NOT for use with ballast or no ballast required is like it says, a 12 volt with no ballast used.
NOTE to measure low resistance accurately takes a quality ohm meter
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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