Microphone switch for Control Wheel
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Switch was defective. When it did not work, I removed it and checked it with a voltmeter. This confirmed the switch was defective. I ended up reattaching the old switch and it worked fine, so new switch was definitely not working.
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The OD of the mounting clip / neck of this switch is 3/4 inch.
The microphone switch for control wheel (06-16300) has the following dimensions: Total length 1.14" switch body .31" metal clip .94" metal clip to back of connectors .75" metal clip to front of switch .39"
It would require a 3/4" hole.