![]() If you hear something rattling around, the filament has broken, and you know the bulb has burnt out or is otherwise damaged. The trick is to shake the bulb lightly once the bulb has cooled off completely. The fuses are intended to melt or “blow” before the copper wires in the string could melt or cause a fire from overload.Īdvertisement How can you tell if a bulb is blown? ![]() Typically, these strings of lights have two tiny fuses, one in each side of the AC line, located inside the AC plug. Why are there two fuses in Christmas lights? Do this in a space where you have plenty of room where the lights do not become tangled again while you work. How to Troubleshoot Three-Wire Christmas Lights How do you troubleshoot 3 wire Christmas lights? If they don’t, put the bulb back in and move on to the next one. If the lights come on, you know that’s the bad bulb. Pull out one bulb at a time, and stick a piece of folded up foil into the bulb socket. How can I tell which Christmas light is out without a tester?
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