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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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