I just bought an analog runtime hour meter. Specs state the operating voltage should be 10-80vdc. Installation instructions state to connect positive to one terminal and negative to the other terminal, polarity not necessary since the unit is polarity insensitive.
Since the unit obviously has a motor that needs to run in one direction only to increment the time, I'm having a hard time visualizing what they've done inside the sealed unit to make polarity a non-issue. Any ideas?
KC