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 Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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