The plug at the end of the set works fine, so current seems to travel to the end of the wires correctly. I have two animated outdoor lighted reindeer decorations that I bought last year and when I put them out this year I found that only half the lights work. My DIL just told me that the new commercial lights my DS bought last year are only half working! A bulb tester made for Christmas lights will be a worthwhile purchase. These lights are key. Gosh, the old outdoor lights we used to buy lasted for years and years!  If one of your light strings isn’t working at all, or if only half of the lights are working, unplug the string and look for a small access door on one side of the male plug (the one with the prongs). If one bulb dies, it can cause the rest of the strand to stop working. If your spares have escaped from the holiday box, take the blown fuses to an electronics store and ask for a replacement. Find The Bad Bulb If one of your LED light strands isn’t working, it’s probably just because it has a bad bulb. If half the string is out, look for the dead bulb closet to the end. Sometimes only a section of the lights will go out, making your job pretty easy. Look for the lights that have a splash of red on the bulb near the bottom. Those were NOT cheap! There should be two. My understanding is that the individual branches are in parallel whereas the lights in each branch is in series. 100 bulbs is a popular configuration. If you find one, open it and inspect the very small fuses inside the plug. Fix Christmas Lights That Are Half … Many Christmas lights are sold with spare fuses for this purpose. On a strand, there are usually multiple braided cords to bring power to the lights. Lady Emma. Net lights are also ideal for this application because they only need to drape the top and front. Also half of the lights and receptacles didn't work either. However, I had a constant hot attached to the previous wiring so the light would remain on 24/7. Find an exact replacement. I have a set of Christmas lights for which the second half doesn't light up. Repairing these lights won't be easy, but with a little determination and know-how, it can be done. 100-light strings typically use 3A fuses, but it's best to confirm your fuses' rating with a store employee. Why? Only 1/3 of my 150 net lights are off. The electrician installed the new ballast and capped off the constant hot and just made the light work with the switch that controls the other lights in the room. The only way to fix the problem is to find the bad bulb. Community Answer. The LEDs are probably strung in series. If you replace the end bulbs and the string of lights still does not work another bulb is the problem. Hello: I just had my T8 florescent light fixture (ballast) changed to use with LED bulbs. Never use a fuse with a higher rating. 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