Quck answer
There are several signs that can indicate if an electric light switch is bad:
1. The switch doesn’t turn on or off the light when toggled.
2. The switch feels loose or wobbly when touched.
3. The light flickers or dims when the switch is turned on.
4. There is a buzzing or crackling sound coming from the switch.
5. The switch plate or surrounding area feels hot to the touch.
6. The switch emits a burning smell.
If you notice any of these signs, it’s best to replace the switch to ensure proper functionality and avoid any potential electrical hazards.
From time to time, simply changing a light bulb won’t be enough to bring back the light. There could be a short in the electric wiring, the breaker might have tripped, or the light switch itself could be faulty. If the breaker is fine, then the light switch is likely the culprit. Most switches last for several years but may require occasional replacement.
Step 1
To begin, turn off the power to the light circuit at the breaker panel. If you’re unsure which breaker it is, turn off the main power switch. It’s a good idea to tape a note or lock the box to prevent others from turning the breaker back on.
Step 2
Next, use a slotted screwdriver to remove the screws that hold the cover plate on the light switch. Loosen the mounting screws at the top and bottom of the switch with a Phillips screwdriver. Gently pull the switch out of the switch box to expose the wire terminals. Take note of the wire colors attached to each terminal and, if needed, make a list or drawing for reference when reinstalling the wiring.
Step 3
Now, disconnect the wires from the terminals. A single-pole single-throw light switch typically has two wires attached to terminals on one side. There may also be a ground wire on the green ground terminal. Loosen the terminal screws with a Phillips screwdriver and remove the electric wires.
Step 4
Proceed to test the switch using a continuity tester. Set the switch to the off position and touch both terminals on the side where the wires were connected. The tester light should not illuminate. Then, switch the light to the on position and touch both terminals with a probe from the tester. If the continuity tester lights up, it indicates that the switch is functioning properly.
Step 5
Lastly, check the switch using a multimeter. Set a digital or analog multimeter to ohms. Calibrate an analog unit by touching the leads together and adjusting the calibration dial or wheel until the meter needle reads zero. Turn the switch off and touch one probe to each hot terminal to ensure the reading shows infinity. Turn the switch on and touch the terminals. A good light switch will display a reading close to zero. Replace any switches that show infinity readings in the on position.
