"Help! My Christmas lights set has gone completely out!"
How do I change a fuse in Christmas lights?
In most sets of Christmas lights, there are one or two fuses located in the male plug. If too many sets are connected in series, they will draw more current than they can handle safely, and the fuses will "blow." Unplugging the sets and replacing the fuses should restore them.
Replacement fuses are usually packaged with replacement bulbs in tiny little bags and taped to the Christmas light strings near the male plug. Be sure to collect these little bags into labeled bags for the future.
Using a small short flathead screwdriver, slide back a little door on the male plug and use a small flathead screwdriver - the kind used to open little screws on battery doors - to gently pry out the burned-out fuse and gingerly install a new fuse.
If replacing the fuse does not solve the "lights-out" issue, an alternative issue might be an unseated bulb. So, if your fuses are OK, look for a damaged bulb base or unseated bulb. If a bulb is damaged, use one of the included extra bulbs as a replacement.
See the links to videos about changing fuses in Christmas lights below.
How can you tell if a Christmas light fuse is blown?
Why do my Christmas lights keep blowing fuses?
Do Christmas lights need both fuses?
Can you change the fuse in a string of Christmas lights?
Here is a quick video on where to find and how to replace the fuse in your set of mini lights. We've also included a quick blog post about stringing too many Christmas lights together.
Originally published on November 4, 2011 3:30 pm. Updated October 5, 2022.