Jim, that E4A would probably be a bear to convert, not only due to HV path that you address, but since the primary & secondary coils rotate & it appears to me that both sides of the points are isolated from ground and rotate, it isn't going to be easy to connect to the points!
In looking into this (I have one on the bench), I noticed something else interesting that I thought I might get you to comment on. Every other spark is of opposite polarity from the previous spark.
Every few months, it seems that there is a controversy about the advantage/disadvantage of a positive vs negative spark polarity & often compounded by some who mistakenly think spark polarity is tied to POS/NEG battery ground.
Well, with the E4A mag you have both! I have never put much in the +/- argument, beyond better electron emission from a hotter electrode & that would occur not at start up when you need it most, but after a run period.
Apparently IH didn't either since theE4A alternates, every other firing.
The shaft has insulators on the bearings to isolate it from the case, which brings up another question for you.........did this mag installation utilize an insulated coupler to the mating shaft? If not, it would seem that isolation would be lost..........it must have used a phenolic insulated coupler.??
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