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The damage is from high current flow through the coil. I am waiting for new coils to try again. Last try without ground wire coils burned out in 5 minutes! Would the air gap also determine the amount of current through the coil? The air gap has been set at .012". I was thinking that a...

I have a lawn tractor model 44N877 that is shorting out the magneto coil. New coils willh work for about 10 - 30 minuets and then the engine dies with no spark. What are the possible causes for the coil to short out?