Sometimes individual lights are burned out other times the entire.
How to check christmas lights that don t work.
Basic mini christmas lights are typically three wire strands.
If this is your problem carefully replace the bulb after first unplugging the string of lights.
Each holiday season i unpack untangle and plug in the previous year s mini lights only to discover that they don t work.
In regions on 230v mains rather than 110v the shunt usually does its job.
Sometimes that makes more sense and can work even faster but it can t always repai.
Christmas lights are connected in series meaning the whole string will go dark when one bulb fails.
Https amzn to 2oebr6z amazon associate link this video shows how incandescent mini lights work and how to diagnose problems tha.
The christmas light tester will indicate which bulbs are bad and need to be replaced.
For families intending to use the christmas lights year after year troubleshooting these lights may be necessary.
Buy the light keeper pro.
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.
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.
Some christmas light testers work by having you slide each christmas light bulb through a hole.
You may find that the bulb has a black or silver looking stain on the inside.