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Quote:
Originally Posted by Terry,OH
Take it apart and clean the contacts. Do not use sandpaper to clean contacts. Also clean the brass threaded terminals on the back of the switch and look at each wire terminal carefully for damage of a loose connection to the wire. Reassemble make sure all is clean and snug.
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I agree, but would be interesting to check the resistance (ohms) before and after cleaning it. As aussie merc pointed out, the resistance should be near "0". Be sure to check it on the lowest scale and zero the meter (if it is the type that requires you to zero it).