If the opener runs the wire that connects the opener to the switch is bad.
Garage door opener control wiring.
A new one should cost you about 15.
The white wire connects to the white terminal and the white wire with the red stripe connects to the red terminal.
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Terminals 1 and 2 are for the opener button you mount in the wall in your garage so you can open the door when you enter from inside the house.
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If the opener doesn t run when you touch the wires at the opener use a small wire and jump those same two wires at the opener terminal.
In my manual these wires are white and white with.
Then check the wires connected to the wall control.
7 wrap the exposed wires around the terminal.
Sometimes the staples that hold the wire to the wall pinch the wire causing a short.
Variety of wiring diagram for liftmaster garage door opener.
Peel about 7 16 inch insulation off of the two connected wire ends on the console wiring that came with the garage door opener using a wire stripper.
It shows the elements of the circuit as streamlined shapes and also the power as well as signal links in between the gadgets.
Reconnect any loose wires that you find.
First make sure that the wall control wires securely connect to the motor unit.
Cross and twist the wires where they meet and run the wires in the channels to the motor.