![]() 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. The bulb didn’t work, and it caused the rest of the light strand to fail.The bulb didn’t work, but the rest of the light strand worked.We found several bulbs that were in one of three states: We didn’t have any special tools for this, so what we did was just start at the first bulb that wasn’t working, and then we tested every other bulb in the strand after it by removing it and testing it with another strand. Once we replaced both bulbs, the entire light strand lit up. ![]() For us, the “pair” part was a key, and through a little trial and error, we found out that the bulb where the light strand stopped working had indeed burned out, but it was also joined up with a second bulb further down the line that had also gone out. The short version of that article is that the way these light strands work is that the light bulbs are connected in series and in parallel, and the most important thing to know is that the bulbs seem to be connected in pairs. We couldn’t fix it by replacing the bulb right where the light string stopped working, so I looked into it and found this helpful (but a little too technical) article. Yesterday we had a three-wire Christmas light string where the first half of the string was working, but the second half of the light string wasn’t working.
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