Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Wiring chamberlain 1/2 h.p. security+

We are trying to install a garage door opener chamberlain 1/2 h.p. security+ three screws marked 1 2 and three is three the safety photo eyes do you know what the one two three is i figure 1 hot 2 neutral

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  • Kaz Masri
    Kaz Masri May 11, 2010

    What screws are you referring to?


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2 is the shared nuetral for the photo eyes and the wall button. 1 and 2 are for the wall button and 2 and 3 are for the safety sensors. All devices are polarized so keep that in mind. Thanks BB

Posted on Sep 05, 2010

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How do I know where to hook wires p on model 621MM master mechanic door opener


Your wires should be color coded blk/ white & solid white you will have a pair for each sensor twist the white wires together and twist your blk/wh wires together now on the back of the opener you should have three screws connect whites to the middle screw a(2) and your blk/white to the third screw (3) your sensors should light up now u should have a solid whte and red/whte connect red/whte to #(1)screw and white to #(2) your wall button should be lite

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Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: i'm reinstalling my garage door opener because the...


Terminal #1 - White wire with red tracer from wall control

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Terminal #3 - Two white wires with black tracer from the door sensors.

May 17, 2010 | Sears Craftsman LiftMaster Chamberlain...

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1 Answer

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1 Answer

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I think someone has used wiring that didn't come with the opener. One the rear of the motor unit are wiring terminals. The sensors connect to terminals 2 and 3. Whichever color wire is connected to terminal 2 goes to the screw marked white and the wire on terminal 3 goes to the screw marked black. This information is if you have a Craftsman or Chamberlain opener.

Sep 02, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Jul 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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1 Answer

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from left to right..
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Jul 08, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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The wall button gets the red and white wire. The safety eyes use the black and white wires. There are two types of attachments on the back of the openers. One has three screws. On this type the 1 is for the red wire, the 2 is for all white wires, and the 3 is for all black wires. The other type has four blocks and you just match the color to the wire color.

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