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

3 Answers

Wiring diagram for garage door opener

The sensor for the garage door opener was accidently knocked off. How do I fix it - there are 3 wires and only 2 places to wire it too.
Thanks for your assistance

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  • ajtoews Jun 30, 2008

    The problem became more complicated as we made the mistake of removing the 2nd sensor (and forgot how it was wired)! Yes, only 2 wires were used of the 3, however, all 3 had the ends stripped and so can't determine which 2 are the correct ones.

  • beenthereb4u Oct 02, 2008

    WE JUST OVED INTO OUR HOME AND THE GARAGE DOOR SENSORS SEEM TO NOT BE WORKING. ONE SENSOR HAS A GREEN LIGHT THE OTHER HAS A VERY DIM LIGHT AND SOMETIMES NO LIGHT EVEN THOUGH THE SENSORS ARE IN LINE NO MATTER WHAT I DO THE DOOR WON'T CLOSE. WHEN THE DOOR IS CLOSED IT WILL OPEN BUT WILL NOT CLOSE. HELP

  • Morgan Rosas
    Morgan Rosas Apr 22, 2014

    Sounds like your lights are misaligned. Try aligning your light and sensor until they both shine brightly.

  • Michael Calloway
    Michael Calloway Aug 18, 2016

    No higher than 6" above ground level, also make sure that there is not sunlight shining into the sensor eye...

  • Michael Calloway
    Michael Calloway Aug 18, 2016

    Also the stripped set of wires should go to the third (last one on the right) terminal and the solid colored wire go to the center terminal. I am dealing with the same issue, however, mine is a 1998 and those set up's were with a three screw terminal board the newer models have a four wire plug in style..Not totally sure 'bout that monster. G'luck. Mike Calloway

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Can you hook up sensors to an older craftsman garage door that never had them?

Posted on Sep 02, 2010

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Normally when a new house is built the electricians will use whatever wire they have to pre wire the garage door sensors so you don't see wires hanging allover your garage. The sensors only need a 2 conductor wire. When you goto fix the sensor you can check the other sensor and see what wire colors were used and use the same colors. Example: sensors have a white and white/black wire (normally). the house may have red, white and green let's say. Just make sure the white goes to the white and the white/black goes to the red. So if you look at all the connections the white is on the same color everywhere (in back of the opener and sensors) and the white/black is on a different (and common color). The installer may have chosen to use green but normally thats not the case.

Posted on Jun 27, 2008

  • Jim  K
    Jim K Jun 30, 2008

    If you haven't removed the wires from the opener then you should get an idea of what colors that were used there should be the same colors at the sensors. The sensors are wired in parallel.

    Also, please verify the brand of opener you have.

  • tommedwin Apr 02, 2011

    I'm really frustrated with my Chamberlain installation. It says to connect the white wire to white and the white/red wire to red. The pre-installed wire in the garage has a blue wire with a white wire with small blue lined wire wrapped together, an orange and white with orange lined wire together, red wire and white with red lined wire, and green wire with white and greened lined wire together. I've tried several combinations and can't get it to work. Any ideas? Thanks!

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Hello, You need the operator/maint. manual to correctly wire this up.

Posted on Sep 28, 2015

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