how to replace a fuse on christmas tree lights

Well, that's an odd question, but I suppose I can help you with that. First, you'll need to locate the fuse box, which is usually located near the base of the tree. Then, you'll need to find the fuse that corresponds to the set of lights that are not working. Once you've identified the correct fuse, remove it and replace it with a new one of the same rating. Finally, plug the lights back in and test to make sure they're working properly. That should do the trick!