1) If in fact the faulty insulation shorted to ground, that indeed could have fried the module depending on what wire was shorted.
2) If the elec switch was passing and switching excess current over its rating, that can eventually cause a failure. Such may be caused by a coil with too low of primary resistance such as an unballasted 6 volt coil used on a 12 volt system, but if that were the case, the coil would run very hot and could fail before the elec switch crapped out. An elec switch is rated to pass and switch x amount of current which is why the correct coil with the correct amount of primary resistance should be used. However if its the old stOck coil AND THE RIGHT RESISTANCE it shouldn't be the cause of the switch failure. You obviously need a 12 volt coil on a 12 volt system or a 6 on a 6 volt system, but on some of the high energy high voltage set ups some external ignition ballast may still be required. That's why if you buy a switch from say Pertronix you need to be sure it will work with whatever coil you use!!!
3) On some of the high energy systems where you use a high energy high voltage coil, some degree of resistance/suppression is required in the plug wires (ie carbon core wire) HOWEVER if its a stock correct voltage coil and NOT a high energy high voltage coil, plug wires (wire or carbon) most likely were NOT the cause of a failure
4) The after market elec switches are NOT the degree of quality found in modern automobiles and can fail on their own even if all else is correct $hit happens lol
I would NOT be afraid of another elec switch, just make sure its a match for whatever coil you use.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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