Glen, I just cant say sittin here IF the module is failing or WHY........ Much of that solid state equipment, once burned in, can last a longgggggggggggg timeeeeeeeee and hardly fail and/or fail only intermittently, i.e. its more of a GO or NO GO situation PERIOD. That being said, until I was fer sure the module was bad, Id more suspect a wiring,,,,,,,,,or grounding,,,,,,,,,,or a faulty (burned/carboned/resistive/loose/worn) Ignition Switch,,,,,,,,,,or a coil problem, especially since it seems to occur when warm which is more of a classic coil or maybe an ignition switch problem.
I think I would start by rigging a hot jumper wire to by pass the ignition switch n see what happens??? Next if it still fails hot wired that pretty well eliminates a switch problem,,,,,,,,,,,,,,,,,,,,,, Next thing is I would insure a good clean bright shiny bond where the module gets its ground to teh distributor,,,,,,,,,,,,Next (sounds like you did this already) Id insure a good clean bright shiny bond from the distributor to the tractor frame ground,,,,,,,,,,,,Next Id remove n clean n wire brush n shine n re atatch each n every coil n distributor n ballast n module wiring connection.
If none of that helps I think Id try another coil and if it still fails FINALLY HEY MAYBE THE MODULE IS BAD AFTER ALL ???????????????
I dont reckon the distributors rotor shaft is worn n sloppy is it??? Those magnets passing by the pickup coil is what triggers the module and if its so worn the gap is jumpy that could pose a problem.
If you can turn the engine over very slowly and have a test lamp on the coils (to distributor) output it should flash between FULL BRIGHT ON and DEAD DARK OFF if the module is working and has a good ground. If when OFF it still has a lil slight glow, theres a ground problem or a faulty module.
I think if you use an external ballast the modules input wires to the ignition switches IGN output or the high input side of the ballast NOT right there at the coils high input as so if no ballast is used IS IT WIRED CORRECT??????
Ima thinkin a faulty ignition switch or a bad ground or a bad coil kind of in that order BEFORE I suspect the module, run the test lamp test n see what it does, that may show a bad ground (dim light when supposed to be full OFF)
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