![]() If all or part of a string of lights is dark, the problem may be a broken filament or a faulty shunt. Just be sure it has the proper voltage rating or you risk damaging the whole light set. If you discover the bulb is burned out or damaged, replace it with a new bulb. You can also test the bulb using the LightKeeper Pro, or a multimeter. When you push the bulb back into its socket, the wires complete the electrical connection. Plus, each wire should be laid flat against the outside of the bulb. They should be firmly attached and not touching each other. It may just be loose and needs to be pressed down more firmly into its socket.Īlso, remove the bulb and look closely at the two tiny wires protruding from its base. If you’re lucky, the “bad” bulb isn’t actually bad at all. You may be able to reveal the bad bulb by simply plugging the lights into an electrical outlet. It combines a voltage detector, bulb remover, bulb and fuse testers, and shunt repairer in one compact tool. The best option is to use either an electrician’s multimeter or a tool specifically designed for repairing Christmas lights, such as the Lightkeeper Pro. Locating the one faulty bulb that’s causing the problem can be tricky. In most cases, simply replacing one bad bulb will fix the entire set or one darkened section of it. I don’t own any special tools, so the solution isn’t very elegant, but by going through the light strand and replacing all of the bad bulbs, I eventually hit on the one (or two) bulbs that were causing the whole strand to fail.Larger light sets often have two or more circuits wired in parallel, which explains why sometimes just a section of the string goes dark. If you have a problem with a set of three-wire Christmas lights that aren’t working, I hope this solution is helpful. It seemed like a lot of work initially, but I found the problem bulbs in less than twenty minutes. ![]() ![]() The keys for me were (a) knowing that the bulbs could be in one of those three states, and (b) just taking the time to test and replace all the bad bulbs until the strand started working again. I assume this bulb was paired with the first bulb in the strand that was out, but I have no way of knowing that for sure. I replaced about four bulbs until I replaced one light bulb and the entire strand came to life.
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