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I have a Chamberlain 045ACT garage door opener. It has a wired push button for opening and closing the door. I want to add a second button, so I can open and close it from two different places. How do I do this? Have you tested to verify it works?

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The pushbutton is an N.O. (normally open) switch. When you press it, the circuit is closed and the opener starts its cycle. It's easy to add a 2nd pushbutton by wiring it in PARALLEL to the first one. That way EITHER one, acting alone can control the door.

For a diagram of this see the 'Switches in Parallel' diagram at:

Switches In Parallel

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