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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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