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It may be the case of an open in the secondary winding only connected by carbon. Carbon is used for resistors. Look very closely at the outside of the coil for a pin sized hole where it arced to ground from running without the plug wire connected. You make energy & if it has no where to go, it finds it’s own way. I could look up the cap but my book was loaned out but it was forever.
That is more or less what I’d expect, except that these coils have been in my shop and not abused by running disconnected. Supposedly these are premium quality German coils. So…..? I’m starting to wonder if there is a lot of bogus product out there.