Squareback alternator testing armature

67Dart273 said

Sorry, a megger is designed to find high resistance shorts---at high voltages

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When I have used a Megger we were looking for broken down insulation between windings and other voltage leaks.

If the insulation is broken down, as an example (10 windings could be shorted making fewer total windings), increasing current draw and reduced output

But that's just my experiance