3 Ways to Wire C9 Christmas Lights and Which One is the Best

Jeff Jerina • September 4, 2023

When wiring C9 lights or C7 lights on houses or commercial properties, most Christmas light installers use one of these 3 methods. But which one is the best? Which way to connect and install Christmas lights ensures that your Christmas lighting project stays lit during the holidays? Which of these three wiring methods keeps water out of your outdoor Christmas lights during the snow or rain? And which of these ways helps you install Christmas lights quick and easy? The answers to these questions and more are in this Christmas light training video.


Watch the full Christmas light training video here on my YouTube channel:


If you’re looking to start a Christmas light business, need Christmas light training, or would like to add Christmas lighting services to your existing business, here are some great resources:



Contents of this video:

00:00 Introduction

00:28 First Way to Wire Christmas lights

04:30 How to Keep Water out of C9 lights

05:12 Second Way to Wire Christmas lights

06:15 Polarity and SPT wire and plugs

08:40 How to Connect SPT plugs

08:59 Third Way to Wire Christmas Lights

10:35 The BEST Way to Wire Christmas Lights - It May Surprise You!

11:07 Things to Consider when using SPT plugs

13:49 Avoid this Wiring Method

14:33 Get More Christmas Light Training


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If you're interested in learning how to install Christmas lights or how to start a Christmas lights business, visit our Christmas Light Training page at:



If you're interested in having Christmas lights installed on your home or business, please send us a quick message on our contact page to START:


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