If all of the bulbs work, inspect the length of wire connecting them, as this could be an issue of corroded connectors, a kinked or cut wire, or a tight connection. If all of the bulbs, and their connections, look to be in good condition, then the next step is to plug the lights in and test them by turning them on.īe mindful when testing the lights, as you don’t want to add moisture to any of the electrical components or create any sparks or fires. If any part of the bulb or connection looks damaged, it’s likely the cause of the problem and that particular bulb needs replacing. Make sure to check each individual bulb and its connection points. Start with the light closest to the plug, then move down the line. The first step to telling which Christmas light is bad is to check each light individually. How can you tell which Christmas light is bad? Hopefully one of these methods has helped you on your way. Without a tester, detecting and isolating a faulty bulb can be a challenge. Keep in mind, though, that this can be dangerous and requires some electrical expertise. This will allow you to identify if a burnt-out bulb is causing an interruption in the electrical flow. This involves removing the appropriate hangers, cutting power to the lights, and checking continuity with a volt-ohm meter. This approach may seem simple, but can be time consuming because you’ll have to source replacement bulbs and unscrew each one.įinally, you can test the connections between each of the bulbs. You can systematically replace one bulb at a time, keeping track as you go to ensure as you don’t miss any. However, this method can be tedious, as it requires you to compare each bulb to the others, and be able to detect subtle differences.Īnother option is to simply switch out bulbs one-by-one. This is especially useful for distinguishing between bulbs that are visibly dark and those that simply aren’t illuminating. Check each bulb to look for any discoloration or damage, such as a broken filament, blackened base, or cloudy glass.
Though success is not guaranteed.įirst, you can try visual inspection.
Finding the bad bulb on Christmas lights without a tester can be a tricky proposition.
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