Well, it's no surprise that so-called "12 volt" coils frequently burn out. The heat generated by the series resistance has to be dissipated whether it's in the coil or in an external resistor. And coils aren't designed to dissipate heat. Leave the ignition turned on for a couple of minutes with the points closed, and you'll find the coil gets very hot. And the heat (from my coil, at least) seems to be concentrated near the top of the coil.
About all you can do, short of installing an external resistor, is be careful not to leave the key on with the motor stopped.
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Today's Featured Article - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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