Light Switch With Three Screws. I assumed it was a single pole switch as it is a simple switch to turn on the bedroom light and there are no other controlling switches, but when I pulled the old switch out of the wall I found three black wires attached to it (two go directly into the switch and a third is screwed on the side). Three-way light switches control a light from two locations, such as from both ends of a staircase or hallway.
Screw the switches back into their boxes, put the switch plate covers on, and turn the power on to test the switches.
Identify the three different colored wires, and attach the new light switch to the wires in the same way they had been attached to the old switch.
Most modern switches have screw terminals You can easily loosen the screws on the side of the device with a standard screwdriver The loop must wrap at least two-thirds but no more than three-quarters of the way around the terminal screw. Use a screw driver to loosen the screws holding the electrical wires on the side of the switch, and then disconnect the wires from the switch itself. I assumed it was a single pole switch as it is a simple switch to turn on the bedroom light and there are no other controlling switches, but when I pulled the old switch out of the wall I found three black wires attached to it (two go directly into the switch and a third is screwed on the side).