Light testers search for the point in the string where the voltage changes between a good bulb with current flowing and a problem area with minimal current.
Easy way to check xmas lights.
If the original neon bulb lights move halfway down the remaining part of the set and try again.
Open the sliding compartment door and remove the fuse s.
Learning how to change a fuse in christmas lights is simple but if your strand of lights does not appear to have accessible fuses move on to step 4.
Either way you are testing 25 of the 50 bulbs without breaking into a sweat.
Then remove the middle bulb of the string and check it with the multimeter.
Easy ways how to fix led christmas lights using a tester led and light keeper pro repair kit tool 16 http amzn to 1r0cgri link supports the channel led.
At first divide the number of lights into two distinct sections.
If the same neon bulb lights then the problem is in the second half of the set.
Then connect the first bulb to the first socket and repeat the process for the second one.
Check the fuse holiday lights usually have cartridge fuses in a small compartment in the cord plug behind a sliding door.