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David,
You've tried three coils? Either you have a small fortune in spare coils laying about or you are using nonoriginal coils. If so, what is the resistance of the primary side of your coils? If not something close to 3.5 - 4.0 Ohms that is a problem. It may not be the problem but certainly one variable to eliminate. If you have a ballast resistor you can try that but the better fix is to get a coil with the resistance built into the primary winding.
The symptom you describe "...like a switch..." is the failure mode of a coil producing spark too weak to fire the sparkplug under load. The intermittent nature of the failure leads me to the primary side. If the problem were on the HT side I would expect misfires prior to outright loss of spark.
Another thing to check; physical connection of the wiring to the coil primary. It is possible that a bad connection is heating up and opening the circuit, cools, connects, heats, opens, ad infinitum. Run a jumper to the coil to bypass the switch and all other connections in the path. Good luck and let us know what happens.
--
Mr. Shannon DeWolfe -- (I've taken to using Mr. because my name tends to mislead folks on the WWW. I am a 51 year old fat man ;-) -- KD5QBL
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