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How do I hook up sensors on my garage door opener using the bell wires that are already in place?

I am trying to wire the sensors. If I run the red and black to the control (red to the red screw and black to white screw), the yellow and green wires are still free. I understand about the red and black wires, thank you very much. But I am wondering about the yellow and green wires. Do I run the yellow to one sensor wire, the white and green to the other one (the white and black stripe one) or do I just leave the yellow and green free not use and use all red and black wires for wiring sensors too? If I can remember, there are double wires up around the unit. There are 2 of each red, black, yellow, and green. Sounds like I need to twist the same colors together before entering into unit. Is this correct? Just wanting to make sure.

Garage Door Openers , Garage Organization & Shelving
1 Answer from this member:
by LYLE W. Earned 1,985 community points in Garage Organization & Shelving
April 16th, 2010
Answered in 19 hours
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