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Liftmaster or Chamberlain Garage Door opener sensor voltage

J_E_F_F

Member
Joined
Sep 7, 2022
Messages
21
We recently took a lightning strike that killed all my garage door openers. I had liftmasters (3280M) from 2010.
I replaced them with wall mount Genie openers which are pretty cool, but I have an issue.

I use some old discontinued (also from 2010) liftmaster laser parking assists, and they are fairly dim on the new Genies. The only 2 terminals that the Genie runs the lasers correctly, are at 3.4vdc, and they are not across both of the sensor wires like the lift master. I can not find details on the 975LM parking assist to see what the operating voltage should be.

I have wired them across terminals of 5v and 8v as a test and they are definitely brighter, but don't cycle on/off appropriately.

Any old liftmaster should work, looking for the voltage between the white and white/black sensor wires, so I know what I need to boost it to.

Any takers?
Thank you,

Screenshot 2025-04-08 9.35.52 PM.png
 
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