Most coil failures I have seen can be traced back where the user runs the tractor out of gas and forgets to turn the ignition key off. This is easy to do. Note this is not a problem with tractors that incorporate magnetos which many of us are accustom to.
If the points happen to be "closed" with the ignition switch on, this severely overheats the coil, breaking down the coil's internal wiring insulation. The failure might not be immediate, and work again intermittently once cooled.
Does your coil feel extremely hot upon failure? If so, this is a sign of compromised insulation.
I have had great luck with the Bosch Blue coil. They have been known to last under extreme conditions in VWs/Porsches, where they are subjected to considerable heat.
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