[TR] Positive or Negative Earth

[Jeffrey Gayton <jtgayton@icloud.com>]

Thanks, as always, to everyone who wrote to suggest using a multimeter. I
wasn't able to get a reading with my semi-random attempts to set the meter
correctly. Guess I'll have to break out the instruction manual, which I
fortunately saved.

Thanks again, all!

** triumphs@autox.team.net **

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