Charlottesville, VA
While that is definitely an impressive meter, you have to be careful using meters on these EM machines - there are often a lot of parallel paths that will give you false readings. Often you'll do better with a 4-foot piece of wire that has alligator clips at both ends. This jumper is used to simulate the short of a properly closed switch or bypass entire sections of switches to narrow down the problem area.
The 2 best tools for diagnosing EM problems are the jumper I just described and a light tester - 2 12V lights wired in series that can be hooked up between 2 points in a circuit to indicate the presence of 25V.
