List Of How To Check Christmas Lights Not Working References. Web test each bulb by giving it a wiggle, starting at the bulb nearest the plug, to make sure none of them are loose. When trying to fix christmas tree lights, start with the simplest possible cause:

Learn how to change a fuse in christmas lights. Once you reach the end of your lights, securely fasten with another hook to hold the end. Each year, look for signs of damage, including frayed wires or cuts or cracks in the wire sheathing along the whole length of each strand.
