how to tell if a christmas light fuse is blown

To tell if a Christmas light fuse is blown, you can look for a few signs. First, check if the lights are not working. If the lights are off, then the fuse is probably blown. Second, look at the fuse itself. If the fuse has a visible black or darkened area, then it is likely blown. Third, you can also use a multimeter to test the fuse. If the fuse is blown, then the multimeter will not show any reading.