How Do You Test Double Stacked Electrical Switches?
A double stacked electrical switch is two wall switches in a box that commonly only holds one. The wiring is connected to two nearby lights or a fan and light combination. Power is usually supplied to both through one electric circuit. There are three simple ways to test the switches to see if either, or both, have failed. Double stack replacements are sold as a unit if either switch is not working. Shut off the power to all circuits with the main breaker switch rather than attempting to find the breaker switch for a light or appliance that will not turn on. Remove the cover plate over the switches by using a slotted screwdriver to loosen the holding screw or screws. Take out the mounting screws on the upper and lower switch with a Phillips screwdriver. Grip the sides of the switch between your thumb and fingers and gently pull it three inches out of the wall box to slowly stretch the wires attached. Mark the positions of the hot wires on the brass-colored terminals with masking tape a
