glennster said: (quoted from post at 09:24:36 01/04/09) if it is a 12v coil, you can still use it on your m, even if the tractor is 6v. zip on over to your local napa, pick up an ignition ballast resistor for an early 1970's b body chrysler . they are about 4 dollars, its a ceramic looking doo- dad with 2 terminals on it. hook your battery power to one side, the other termainal goes to the coil .
If you use a true 12V coil AND a resistor on a 6V system, the spark will be extremely weak, if it sparks at all.
The 12V coil already has one resistor in it that cuts the voltage roughly in half. If you put 6V to the coil, it'll see 3V through the resistor.
Adding an external resistor will cut the voltage by half again. Now instead of 3V, the coil will only see 1.5V, about as much as a flashlight battery.
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