Replace the fuse Most new packs of Christmas lights come with a replacement fuse—which should give you a clue as to how common fuse problems are with these things.

With a small flathead screwdriver, remove each of the fuses out by leveraging your screwdriver under the metal end of the fuse and popping it out. Replace them with the extra fuses that came with ...

Lighting up Christmas: The quick fix for broken light sets The LightKeeper Pro, from Ulta-Lit Tree Company, is a tool that repairs most sets of malfunctioning miniature Christmas lights.