Check the entire strand of lights for a missing damaged or abnormal looking bulb according to the christmas light company website.
How to check christmas lights that don t work.
When an entire string of lights stops working or a section stops working it s important to troubleshoot the issue in order to get the lights working again.
You may find that the bulb has a black or silver looking stain on the inside.
Sometimes individual lights are burned out other times the entire.
A failsafe called a shunt in each bulb is supposed to prevent this by closing the gap across the burnt out bulb but these often don t work properly.
The christmas light tester will indicate which bulbs are bad and need to be replaced.
Christmas lights are connected in series meaning the whole string will go dark when one bulb fails.
Sometimes that makes more sense and can work even faster but it can t always repai.
Second test the christmas light bulbs with an inexpensive tester available where holiday lights are sold and online usually changing a problem bulb or tightening it will fix the entire strand.
For families intending to use the christmas lights year after year troubleshooting these lights may be necessary.
Https amzn to 2oebr6z amazon associate link this video shows how incandescent mini lights work and how to diagnose problems tha.
Buy the light keeper pro.
If this is your problem carefully replace the bulb after first unplugging the string of lights.
In regions on 230v mains rather than 110v the shunt usually does its job.
I also tried a light keeper pro to get a string of lights working.