Before you attempt to fix a faulty light switch, make sure you understand the basics of light switch wiring.

Next, refer to the switch-wiring photo you took earlier to connect the existing wires to the new switch. Here’s how a single-pole switch is typically wired: The electrical box usually has two ...

Below, Donnelly tells AD how to wire a light switch with this simple step-by-step process for a single-pole light switch without zapping yourself along the way.