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Bathroom Exhaust Fan and Light Electrical Wiring

How to Wire a Switch for Bath Exhaust Fan and Light: I have a new bathroom exhaust fan heater light to install in place of an old one and wire the switches.

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Switch Wiring for Bath Fan and Light
[ad#block] Electrical Question: I have a new bathroom exhaust fan heater light to install in place of an old one and wire the switches.

This electrical wiring question came from: James , a Homeowner from Laramie, Wyoming.

Additional Comments: I like the website. Lots of useful and helpful information for a guy with limited knowledge about these things 🙂

Dave’s Reply:
Thanks for your electrical wiring question James.

How to Wire a Switch for Bath Exhaust Fan and Light


wiring a bath exhaust fan and light

Application: Wiring a Switch for a Bathroom Exhaust Fan and Light.
Skill Level: Intermediate to Advanced, best installed by a licensed electrical contractor.
Tools Required: Basic Electricians Pouch Hand Tools and a Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with tools and the access to the wiring for the wall switch for the exhaust fan and if a larger switch box will be required.
Precaution: The combo bathroom exhaust fan circuit should be identified, turned OFF and Tagged with a Note before working with the wiring and installing the fan speed switch.
Notice: Modifying existing wiring or installing additional bathroom electrical wiring should be done according to local and national electrical codes with a permit and be inspected.

How to Wire Switches for an Exhaust Fan


More about Wiring a Bath Exhaust Fan and Light

Bathroom Electrical Wiring

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How to Install Bathroom Electrical Wiring
Bathroom Electrical Wiring
Fully Explained Photos and Wiring Diagrams for Bathroom Electrical Wiring with Code Requirements for most new or remodel projects.

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Wiring GFCI Outlets
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Be Careful and Be Safe - Never Work on Energized Circuits!
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FAQs Frequently Asked Questions and Comments

4 Responses to “Bathroom Exhaust Fan and Light Electrical Wiring”
  1. Pat Beck says:

    I have 2 switches to control my light and bathroom fan. The light is the red feed.
    The new fixture, fan/light combo, has a capacitor red from motor-cap; capacitor out is black to white at motor
    also from motor is a white to light & black to black light

    How do I connect my w/b/red from my switches?

  2. Dave Rongey says:

    Hi Pat,
    Quite honestly I would look at the wiring diagram that came with the new unit. I rarely have seen a bathroom exhaust fan with a cap, and if so they are pre-wired or connected where the only leads left were the 120 volt line connections.

  3. mike says:

    I have an existing bathroom fan{only}I took it out to clean but now i cant figure out how to wire it back up ground on the power side just black and white same on the fan and wire going to the switch,when i put the 3 black wires together and then the white ones the fan always runs what am i missing? Thank you.

  4. Dave Rongey says:

    Hi Mike,
    From what you have described, one set of black and white wires are most likely the wires used for switching. To fix this problem both sets of wires need to be identified as the incoming power, and the switched wires. The black wire of the incoming power is then connected to the other wires which will got down to the switch and back up. Connect the wiring accordingly. The white neutral of the power source connects directly to the white neutral wire of the bathroom fan. Keep in mind that the wires used for the switch just creates a loop where the switch is in the middle.
    I hope this helps,