One series leg has a bad bulb that took out the rest.
Christmas tree lights half string out.
Watch as lou manfredini ace s home expert shows you how to troubleshoot if your christmas lights are half out.
Check the entire strand of lights for a missing damaged or abnormal looking bulb according to the christmas.
How to fix half a string of christmas lights that are out step 1.
Learn what to check and how to fix it.
A light bulb has come out of its socket or is half out of its socket and it has brought down the circuit.
In other words plug one end of your half working string into an outlet then connect a fully functioning string to its other end.
Before doing this confirm that the second string is fully functional by plugging it into the outlet on its own.
Its usually s a split string with half the lights on series on one leg and half the lights in series on the other leg.
Or their lights suddenly half go out during installation.
Plug a light string that works into the half out string.
Incandescent christmas tree lights aka mini lights are wired in series so if your lights go partially out you have one of three issues.