Basically what you need to do is attach the outlet feed wires to the back of the garage light switch to estabilish a passthrough circuit.
Power light resistor wire for garage door opener.
Stretch the wire up the wall until you come to the top corner of the opening.
Remove the door opener light bulb.
Staple the wire secure and stretch it over to the point that the opener rail attaches to the top of the garage door.
Get it as soon as fri sep 18.
Install a piece of 12 2 with ground cable between the ceiling cutout for the light and the garage door opener s motor housing.
Wireless remote switch 90v 264v 30a 433mhz rf universal remote controller relay kit for household lights ceiling garage door opener high power electrical equipment motors pumps farm irrigation more.
Repeat for the opposite side.
Identify and disconnect the power to the garage door opener circuit.
Place a staple over the wire to secure it to the wall.
Cut this cable so that it extends 18 inches from the ceiling opening.
I have 2 of these modified switches one by the front door and one by the rear allowing me to open and monitor the garage door from either spot.
This will allow the electricity from the circuit before the switch to pass directly through to the outlet for the garage door opener.
Mount the junction box near the garage door opener making sure that is will not be affected by the door opener or the travel of the garage door system or moving parts.