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Ceiling Fan Blue Wire: Purpose & Connection Guide

This article explains the purpose of the blue wire in a ceiling fan and provides instructions step by step to connect it.

If you’re reading this article, you’ve probably spotted a mysterious blue wire sticking out from your new fan’s motor as you go through the installation and wiring process. Feeling a bit unsure about where it fits in?

No worries! This article will highlight its purpose, where it should be connected, and the steps to connect it correctly. So, keep reading!

Key Takeaways:

  • The blue wire in a ceiling fan enables the light kit.
  • You can control the fan and lights with the blue wire and single or separate switches.

What does the blue wire on a ceiling fan do?

The blue wire is an extra wire used to connect and enable the light kit for the fan. This wire commonly comes with ceiling fans with a built-in light kit.

If your ceiling fan comes with a light kit, that blue wire from the fan’s motor will enable its lights.  Connecting this blue wire is important for the light kit to work.

Where and how do I connect the blue wire?

So, there are two ways to connect this wire correctly. The lights can be used together with the fan itself, or they can be set up and used separately. Both situations are explained in detail below:

Scenario 1: Connecting the Light Kit and the Fan With a Single Switch

If you have a single switch, no remote for your fan, or you simply prefer to operate the fan and light kit together, it’s a breeze! Follow these steps to connect them:

  1. Identify the wires: First, locate the blue and black wires that need to be connected.
  2. Connect Both Wires Together: Take the blue wire and the black wire and twist them together. This creates a connection between the light kit and the fan’s power supply.
  3. Connect to the Wall Switch: Now, take this twisted blue-black wire combination and connect it to the main wire coming from your wall switch to the ceiling joist. This effectively ties both the fan and the light kit to the single switch.
  4. Connect Grounding Wires: You should have a green grounding wire and a yellow or bare copper wire. Simply connect the green wire to the yellow or bare copper wire. This creates a secure grounding connection.
  5. Connect Neutral Wires: Lastly, connect the white wire from the ceiling junction box to the white wire from the fan’s motor. This links the neutral circuit, ensuring the electrical system functions correctly and safely.

The rest of the wires, including the green ground wire, the white neutral wire, and the yellow or bare copper wire, will be connected normally.

Now you can test the connection by turning on the wall switch. If everything is properly connected, both the fan and the light kit should turn on simultaneously.

Controlling Lighting with Pull Chains:

Now that everything is set up, you can use the pull chains on your fan to adjust the fan speed and the lighting. Here’s how:

  1. Identify the chains: Typically, your fan has two pull chains. One for adjusting the fan’s speed and the other for controlling the lighting. To control the lights, locate the pull chain designated for the light kit. There could be a “light symbol” on it.
  2. Pull Chain for Lights: Gently pull the designated pull chain that controls the lights. You’ll usually find this chain hanging below the fan blades or attached to the light kit itself. Pulling it once will turn the lights on, and pulling it again will turn them off.

That’s all there is to a single-switch scenario. Now, let’s talk about the multi-switch scenario.

Scenario 2: Connecting the Light Kit and the Fan With A Multi-Switch

If you’re looking to control your fan and lights separately with different switches, here’s how to do it:

Step 1: Connect the blue wire to the ceiling live wire

  1. Inside your ceiling box, look for the secondary live wire, often in black or red color.
  2. Now, simply connect the blue wire from your fan to this secondary black or red wire from the ceiling. This connection lets you control the light kit independently with its own switch.

Step 2: Join the power wires together

  1. Locate the primary black power wire, crucial for the fan’s operation.
  2. Connect this primary black power wire to the black wire of your ceiling fan. This connection ensures that the fan’s power is correctly linked and ready to go.

Step 3: Connect the remaining wires

As mentioned earlier, the rest of the wires should be connected as usual.

  • The green ground wire should be linked to the green or bare copper wire.
  • The white neutral wire from your ceiling junction box needs to connect with the white wire from the fan.

And that’s it! Problem solved! With these steps, you’ll have individual control over your fan and lights, making your space more comfortable and versatile. Enjoy your newly installed fan with a functional light kit!

Also, check out our detailed ceiling fan wiring tutorial for more detail.


Is a blue wire positive or negative?

The blue wire in the ceiling fan is a neutral wire.