Bathroom Light Switch Wiring Diagrams

By Dave Rongey - Summary:

Installing Electrical Wiring for a Bathroom Light Switch with the help of Wiring Diagrams…

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How to Wire a Bathroom Light Switch

Home Electrical: I’m replacing a light fixture in a bathroom.

  1. The bathroom also includes an exhaust fan, no light, two separate switches for light and exhaust fan.
  2. The connections from light to box are black to red wire, white to white wire, ground to green wire.
  3. There are also two cream wires coming out of box that I assume are for the fan.
  4. Do they connect to the hot wires red/black or to each other to complete the circuit?

This electrical question came from: Trudy, a Homeowner from Vernon Hills, Illinois.
See more about Home Wiring for Illinois

Dave’s Reply:
Thanks for your home electrical question Trudy.

Electrical Wiring for a Bathroom Light Switch with Wiring Diagrams

  • Trudy the cream color wires should be verified, however each function for a light or exhaust fan will require a hot, neutral and ground wire to be connected to a voltage source and through the wall switch.
  • Once the power source has been verified then the connections should be clear.

The Following will assist you with your Bathroom Light Switch:

Wiring Diagrams for Light Switches

  • Electrical Wiring Diagrams

  • Home electrical wiring diagrams are an important tool for completing your electrical projects. An electrical wiring diagram can be as simple as a diagram showing how to install a new switch in your hallway, or as complex as the complete electrical blueprint for your new home or home improvement project.

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Wiring Diagrams Directory

You identified your project to be about Light Switch Wiring,
so you might find this information useful:

Light Switch Wiring
Light Switch Wiring

  • Wiring a Light Switch – Diagram 1

  • Fully explained pictures and wiring diagrams about wiring light switches describing the most common switches starting with photo diagram 1.

Wiring Bathroom Exhaust Fans

  • Installing Your Bath Exhaust Fan

  • Answers to all of your questions about installing a bath exhaust fan and your bathroom exhaust fan replacement project.

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FAQs Frequently Asked Questions and Comments

6 Responses to “Bathroom Light Switch Wiring Diagrams”
  1. John Robinette says:

    How do i wire a bathroom exhaustfan/light to a 2 way switch? I want to be able to turn on the light & exhaust seperately. It had an old heater fan in the ceiling with one switch operating the heater only.

    • Dave Rongey says:

      If there was only one switch for the original heater fan then an additional cable will be required for the second switch to enable independent switching capability.

  2. Tommy says:

    OK here goes. I am changing a light fixture in my bathroom. in the box behind the light I find 4 sets of wires. I notice that when I turn the power off, it shuts down the the lights in my living room, dining room, and kitchen, how do I find and connect the right wire for just that bathroom light with all these other one meeting in that one place?

    • Dave Rongey says:

      Hi Tommy,
      I always recommend that when changing out a light fixture that you only work with the wires that are connected to the existing light fixture, and then the wiring is straight forward. But if for some reason all of the wiring have been taken apart then a voltage tester will need to be used to identify what all of the wires are used for. What we typically discover is that there is only one cable that is the power source, one (or more) cables that travel out to the living room, dining room and kitchen, and then we discover that on cable may be used for switching to hot leg of the circuit for the light fixture. I would suggest taking a look at the wiring diagrams for light switches (as shown above) which will help you understand some of the different wiring scenarios.
      I hope this helps you,

  3. Joe says:

    My bathroom has a wall switch with three rocker switches. One switch operates a light over tub, but also operates a light in the toilet room. The other two switches operate other lights in the bathroom. The toilet room also has a rocker switch that also turns on toilet room and light over tub.

    What needs to be done to just have the toilet room operate just the toilet room and not the tub light, and also the main wall switch so it just turns on the tub light and not toilet light?

    • Dave Rongey says:

      Hi Joe,
      To change from two switches to a single switch to control a light the wiring configuration will need to be changed at both switch box locations. The exact wiring connections will depend on how the circuit is now configured. Therefore, the existing circuit power, and the wiring used for the switching process will all need to be identified before making the conversion to the new switch setup. Now doubt, this can be done as you have described, however the identification of the wiring must first be understood in order to make the wiring changes. Check out the Wiring Diagrams for Switches that I have provided to assist you further.
      I hope this helps,


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