![]() ![]() This Stanley 4 in 1 Christmas light tester will test light strings, light bulbs, light fuses, and will remove light bulbs. Light testers are designed to find the defective bulbs without you having to remove every bulb from its socket.įrom the Manufacturer. Even if you find the burned-out bulb, you might be putting in a replacement bulb that isn't seated, and the string still won't light. ![]() But this method takes a lot of time and isn't foolproof, since you can't always tell whether you've managed to position the bulb in the socket correctly. You can check each individual bulb by replacing it with a bulb that you know to be good. However, these shunts often fail, and the result is the same as if they didn't exist: The entire string of lights goes off. When the shunts function properly, it's easy to spot the defective bulb. Newer light sets have a shunt, a small piece of wire, inside each bulb that maintains the connection when the filament is gone and keeps the other bulbs lit. When a bulb burns out, meaning that the filament that actually produces the light has evaporated, it breaks the connection, and the whole string of lights goes dark. Rslogix 5000 Serial Number Product Key there. Promoted by The Basics Christmas light strings are wired in series, which means that every light must be functioning in order for the string to be lit. Capricorn Christmas Light Tester Manual 9,6/10 6385votes
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