ok, let's see. if you have 12v to the first plug, but not to the rest, you need a jumper to ground and test for voltage on each one.
what I'd do is get the meter and test for voltage between the resistance wire and the top on each one, and see if you find volts.
in other words, take the meter, and set it to dc volts, and put the probe on the upper and the lower connection.
test each plug. the one that shows voltage is the one that's bad.

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