Don't miss this one... The know it alls on FB told me a megger is not used for this purpose and I'm a hack. Well here it is in living color, a megger is not just for checking motors and compressors. Its purpose is to test insulation integrity, any wire can be tested but please avoid anything attached to electronics. I actually started using this trick initially with the Supco M500 and realized how many problems you can find, for example: carbon tracking. On this test I'm using the Klein Tools ET