Replacing a switch is a project almost anyone can tackle. If you find that current is allowed to pass through the switch regardless of the position of the onoff toggle then replace the old switch with a new three way switch.
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How to change a light switch in an old house. Remove the suspect switch from the box and use a continuity tester to test its operation. Then use a voltage tester to make sure that the circuit is dead. The regular light switch replacement procedures are shown on many other videos. If the wires are connected to screw terminals turn each screw counter clockwise with a screwdriver to loosen and slide the wire out with a pair of needle nose pliers. In this video discover the right questions to ask to ensure you purchase the right switch for your needs. This video only covers the old work box type switch.
Unscrew and remove the switch plate. In box 1 disconnect a wire on the old switch and attach it to the correct terminal on the new one. Disconnect the wires from the old switch. This video shows how to replace a light switch in a mobile home. Unscrew the switch from the electrical box and pull it out with the wires still attached. She gives step by step instructions so that the beginner or novice can easy follow the steps and complete this task.
To replace this kind of switch follow these steps. Then learn the simple steps to. Leah from see jane drill demonstrates how to replace a single pole light switch. There is no neutral wire connection in most lights switches which makes replacement fairly easyits a simple matter of disconnecting two hot wires from the old switch and reconnecting them to a new switch. Methodically dealing with one wire at a time will help avoid confusion and mistakes. Turn off the power to the switch at the main circuit breaker or fuse panel.