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More installments for my model train electric company! This is what the field guys would use to test relays at power plants when a failure occurred, and I figure I better test the ones here too and make sure EveryCircuit relays are in working condition, all jokes aside relays work on physical switching moving and there for they are susceptible to failure often. This circuit tests them, with a single power on a single closed circuit, by default the red LED indicates current not throwing the relay, change the switch, and if it is good (not rust or otherwise inoperable) the green LED will come on. If any or both L.E.D.'s do not light on switching, then you have a bad relay and relays have a high potential for failure because of the moving parts causing wear quickly over long periods of time. - nforystek
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