How To Change Smoke Detector Battery When It Is Hardwired. Make sure the negative and. Next turn the power back on and test the smoke detector via its test button.
Press the test button and listen for a beep. Next turn the power back on and test the smoke detector via its test button. Connect the new wired smoke alarm.
Push the wires into the ceiling box.
Twist the black hot wire on the new plug or alarm clockwise together with the circuit wires using pliers and then screw on a wire cap and tighten it. This helps avoid the problem of occupants turning off the breaker and leaving it off. Get a competent electrician on site who knows how to properly mount a box at that location. Remove the old battery and replace it with a new one.
