From the wall control there are 2 wires. One with a red stripe goes to terminal #1. One solid white goes to terminal #2. From the door sensors the solid white wires go to terminal #2 and the 2 wires with black stripes go to terminal #3.
SOURCE: garage door sensors
#2 and 3 on my opener. #1 and 2 are atteched to the wall button. So # 2 has both attached. Hope that helps.
SOURCE: liftmaster 1265LM garage door opener control wiring diagram
If you are looking for a schematic diagram they are not available.
SOURCE: Wiring diagram for garage door opener
Can you hook up sensors to an older craftsman garage door that never had them?
SOURCE: Where can I get a wiring diagram for a Lift master
Call around to Liftmaster dealers in the yellow pages. They may have something you can use.
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