Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
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
Can you hook up sensors to an older craftsman garage door that never had them?
Posted on Sep 02, 2010
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
Hello, You need the operator/maint. manual to correctly wire this up.
Posted on Sep 28, 2015
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Posted on Jan 02, 2017
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