Complete the following steps to replace wired door alarm sensors.
Sliding patio door hook up alarm wire.
You do not need to fish the wires out from the wall.
The best alarm contacts for sliding doors are skinny contacts that can properly fit on the door and its frame.
Remove the old sensor.
Both wireless and hardwired sensors can be used for this purpose.
In most cases it is wise to use a surface mounted sensor with a sliding door.
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Use a screwdriver to disconnect the wires from the old sensor.
If the sensor is recessed you will need to pull it out from the door frame to access the screw terminals.
The second best location for alarm wiring is at the opening side about 18 above the floor.
This location calls for a recessed contact and magnet.
Using a surface mount magnetic door switch and will make this easier in most cases.