Why does my light switch not turn off after installation?
Why does my light switch not turn off after installation? Light Switch Won't Turn Off After Installation. Although the principle of light switch wiring is fairly basic, things can sometimes get confusing when the switch is in the middle of a circuit or it controls more than one light and there are multiple wires in the electrical box. Why are my interior lights not coming on? If the switch is bad, corroded, or you have a blown fuse, your interior lights might fail to come on. Alternatively, a bad ground can cause your lights to stay on. Inspect the switch...