Quote:
Originally Posted by SD1too
Place your multimeter on a low resistance range across pins 3 & 4. You will either get a reading of zero ohms or infinite resistance.
Now place 12v across pins 1 & 2. The reading on the meter should change to the opposite state. In other words, if you got zero ohms to begin with, after application of the 12v you should see infinite resistance.
Simon
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I'll give it a go, thank you
macafee2