21-05-2021, 12:10 AM
As John has observed some of the mains based testers were fearsome. One involved application of mains volts, then checking for a spark on discharge. Did not always get one, depending on where in the AC cycle the contact was broken, but any a fairly sure test. Engines should not be run or cranked with an open circuit coil secondary. High voltages in pri and seconadry develop.