How do Christmas lights with 3 wires work? - Quora It depends. In Canada at least, the three wire system is generally one that is equipped with a plug at one end to attach to the wall outlet, and an outlet at the other end to attach a second string of Christmas lights. The lights on the string are.. I want to repair an LED Christmas light string with 3 I want to repair an LED Christmas light string with 3 wires per bulb. How is this string wired So for an extra wire per bulb this design gains redundancy- one bulb of any or multiple pairs can be missing Below diagram from here: share | improve this answer. answered Dec 16 '16 at 16:09. Spehro Pefhany Spehro Pefhany. 229k 6 6 gold How to Shorten String Christmas Lights | Gray House Studio How to shorten string Christmas lights to the exact length you need. As you can see in the diagram, the red wire is not connected at all. You must switch the Christmas String Light Wiring Diagram Detailed Throughout If you like this picture please right click and save the picture, thanks for visiting this website, we provide a lot of options related to Christmas String Light Wiring Diagram Detailed Throughout 3 Wire images for you, do not hesitate to come back. How to fix a three-wire Christmas light string Yesterday we had a three-wire Christmas light string where the first half of the string was working, but the second half of the light string wasn’t working. We couldn’t fix it by replacing the bulb right where the light string stopped working, so I looked into it and found this helpful (but a little too technical) article. 3 Way and 4 Way Wiring Diagrams with Multiple Lights - Do Wiring 2 Lights and 3 Way Switches. This diagram illustrates another multiple light circuit controlled by 3 way switches. Here the source and the fixtures come before the switches. As with the other diagrams on this page, more lights can be added by duplicating the wiring arrangement between the fixtures. simple wire connections and led light wiring - YouTube a quick explanation of how to find which wires are positive and negative on many inexpensive led lights. a quick demonstration of solderless wire splic..