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I also agree the Stevens tester works great. I have seen those small arcs you’re talking about. I can’t explain them but have run coils that have them in that location and they have been fine. Maybe some kind of secondary induction but it’s way above my pay grade. The leakage probe, when it finds a leak, will draw a arc that is quite pronounced, between an eighth and three eights of an inch.
The condenser leakage test is awesome. It really separates the men condensers from the boy condensers, if you will. On the Mercs, you will find almost every single original Phelon condenser will test bad. New ones will test good. And even though a lot of old Phelon condensers will allow enough spark to run, you will easily notice the difference between a new one and an old one, when doing an open gap spark test. When the Stevens says they are bad, they ARE bad.
Long live American manufacturing!