Once inside the sensor hard to say what the electronic board is doing with the voltage once it is fed in.
Low voltage transformer for garage door sensors.
However a high current low voltage short circuit automobile battery can cause an arc flash and possible burns.
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Garage door opener sensors.
The voltage to the sensors is usually transformed at the main opener to low voltage probably dc but maybe ac.
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Garage door openers use a receptacle in the ceiling for power.
I used the other door opener which is the same model for comparison took the sending sensor and touched the wires to the two voltage output screws on the functional door and it lit.
Low voltage when the source is operating properly will not provide a shock from contact.
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I have the model 139 53627srt garage door opener and the door sensors are not lighting.
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On sears model 139 53990 garage door opener the safety sensors have now failed to work after an electrical storm.
Garage door opener wiring.
No led lights on either sensor.
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Ohm s law and low voltage.
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Garage door openers use safety reversing sensors to prevent the door from closing if a child pet or any object is under.
Usually 12 volts dc so your 13 volt reading is likely correct.
The door will close only when holding down the button the voltage at the operator unit at the sensor wire connectors with the wires removed is about 1 1 2 volts.
I checked voltage where the wiring connects into the unit.
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