Posted by 300jk on October 18, 2021 at 15:10:35 from (172.58.235.225):
Can someone explain to me in laymans terms the difference between a 12v coil no external resistor required that is rated at 3 ohms vs one rated at 1.5 ohms. Yes I understand 1.5 is half of 3. Im not sure what it means when one or the other is on a tractor. Ive been fighting with our 1650 Oliver. Has electronic ignition. I have the correct wires, and want to make sure I have the correct coil. Petronix says to use a coil rated at 3 ohm for 6 cylinder applications unless its a racing application which the you would use a 1.5 ohm coil. Ive been fighting this tractor and have several posts on the Oliver board. Im posting this here because of a little more traffic. Currently it has a 12v coil on it from Napa which says no external resistor required. Not sure of the ohm rating of it.
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