try adding a piece of wire linking mag plate surface to engine surface this will ensure electrical conductivity between sparkplug bodies and the ultimate return path to the high voltage coil winding (the secondaty winding)
when you push down on the mag plate you are probably closing the path
mesh shielding from a piece of TV coax cable makes a nice flexible conductor
just for a test … with that new coil
you should now read a good 4-7 kohms on the secondary at the plug boot when measured to the engine main body
if not find out why !! press down on the mag plate to see if 4-7kohms suddenly appears
both secondaries should have solid 4-7 kohms
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