However a high current low voltage short circuit automobile battery can cause an arc flash and possible burns.
Low voltage transformer for garage door sensors.
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Garage door openers use a receptacle in the ceiling for power.
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Ohm s law and low voltage.
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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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.
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 opener wiring.
I checked voltage where the wiring connects into the unit.
Once inside the sensor hard to say what the electronic board is doing with the voltage once it is fed in.
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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.
Garage door opener sensors.
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On sears model 139 53990 garage door opener the safety sensors have now failed to work after an electrical storm.
No led lights on either sensor.
Doorbells garage door opener controls heating and cooling thermostats alarm system sensors and controls all.
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The wired controller and sensors use low voltage wiring usually 24v to connect to the motor unit.
Usually 12 volts dc so your 13 volt reading is likely correct.