Turn the switch on then touch the tester leads to both of the brass terminals on the switch and verify that the tester led goes on.
Led lights glow with switch off.
If the led goes off the switch is good and the wiring is faulty but if the led stays on the switch is bad and needs to be replaced.
After switching to leds or when replacing a faulty led lamp in some cases the led continues to glow weakly after turning the light switch off.
In most of these cases the led just lights up very weakly but also this.
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Led lamps are different though and in some cases that current may just be enough to actuate the circuitry in your lamp and cause it to glow albeit dimly when the light switch is off.
Turn the switch off then repeat the test.
After switching to leds or when replacing a faulty led lamp in some cases the led continues to glow weakly after turning the light switch off observing this effect the first time could be very surprising the light switch is in the off position and the led lamp continues to glow.
Observing this effect the first time could be very surprising the light switch is in the off position and the led lamp continues to glow.
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Short of rewiring your lighting one solution is to stick something in the circuit to mop up this unwanted voltage.