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- Jun 21, 2012
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- 4,889
Easy enough to check that too: measure the coil continuity using the diode scale. Should read about 0.7 volts, the forward drop across a silicon diode in one direction, the actual coil resistance or about 25 ohms in the other direction. If you get the same resistance in both directions, double check this using the ohms function; if still about 25 ohms with the multimeter probes in either direction, there is no diode.Hoping there is not an undisclosed built-in diode paralleled to the coil, and being reverse fed...
Make sure when checking the contact continuity that one multimeter probe is on the moving contact and check for continuity to the remaining two contacts with the coil first energized and then de-energized. It sounds like you may have been trying to produce a circuit between the normally-open and normally-closed contacts, ignoring that these must be used in conjunction with the moving third contact.