If you're experiencing issues with a Christmas light fuse, it's important to approach the situation with care and caution to avoid any potential hazards. To replace a Christmas light fuse, you'll need a replacement fuse of the same amperage and voltage rating as the original. First, locate the fuse box where your Christmas lights are connected. There should be a removable panel covering the fuses. Once you've accessed the fuses, you can remove the blown fuse by gently pulling it out of its holder.