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Old 01-28-2013, 04:16 PM
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It is never a given that any part of the controller output is grounded. That can make resistance-to-ground measurements superfluous, unless all conductors are tested.

As noted, "I got 24 volts" says nothing about the actual circuit path quality.

Even resistance measurements may turn up nothing. Old-time mechanical controllers gave zero info about electrical faults. This is where the clamparound ammeter came in, as it could show a higher-than-usual current draw on a solenoid that refused to go to shorted status while the repairman was watching. They had to have voltage applied to show the fault.

The yellow clamparound ammeter was a Sperry model that had an extra range of 1.5 amps full-scale, good enough for the higher current draws of old-time solenoids.
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