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.
Low voltage transformer for garage door sensors.
Doorbells garage door opener controls heating and cooling thermostats alarm system sensors and controls all.
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Garage door opener wiring.
The voltage to the sensors is usually transformed at the main opener to low voltage probably dc but maybe ac.
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Once inside the sensor hard to say what the electronic board is doing with the voltage once it is fed in.
However a high current low voltage short circuit automobile battery can cause an arc flash and possible burns.
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Low voltage when the source is operating properly will not provide a shock from contact.
Garage door openers use safety reversing sensors to prevent the door from closing if a child pet or any object is under.
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Garage door opener sensors.
Usually 12 volts dc so your 13 volt reading is likely correct.
Ohm s law and low voltage.
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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.
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I checked voltage where the wiring connects into the unit.
I have the model 139 53627srt garage door opener and the door sensors are not lighting.
No led lights on either sensor.
Garage door openers use a receptacle in the ceiling for power.
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