Step 8: Connect the new dimmer switch

connecting dimmer
Photo: Kolin Smith
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Take the loose end of the remaining 8-inch black wire and connect it to the black wire on the dimmer switch, using a wire connector.

Attach the dimmer's yellow wire to the black wire coming from the newly installed light fixture.

Connect the bare copper ground wire coming from the GFCI to the dimmer's green grounding wire, using a wire connector.

Connect the final white wire to the dimmer's white wire, using a wire connector.

Carefully fold the excess wires into the box, then secure the GFCI and dimmer switch with the screws provided.
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    Tools List

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    • flat prybar
      Flat pry bar,
      to remove the old electrical box
    • Phillips screwdriver
      Phillips and slotted screwdrivers
    • drywall saw
      Drywall saw,
      to cut the hold for a new electrical box
    • spade bit
      1/2-inch spade bit,
      to bore a hole in the wall for a new cable
    • wire strippers
      Wire strippers,
      to remove insulation from wires
    • lineman's pliers
      Lineman's pliers,
      to cut and twist together wires
    • drill
      Drill/driver,
      to drive screws and bore holes

    Shopping List

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    1. Light fixture Undercabinet lights are available in fluorescent, halogen, and xenon models. We chose low-voltage halogen for its bright white light (see "10: Choosing the Light"). Measure upper wall cabinets to determine what length fixtures to buy—23 inches and 47 inches are typical sizes. You can gang them together for long runs.

    2. Dimmer switch needs to be compatible with the light fixture you choose.

    3. GFCI receptacle Once installed, this outlet’s ground-fault circuit interrupter will shut off instantaneously if you receive a jolt.

    4. Two-gang, old-work electrical box This larger box replaces the existing single-gang receptacle box in the backsplash wall. An "old work" box is for remodeling—its "fins" unfold behind the drywall to lock it in place.

    5. Two-gang wall plate

    6. 12/2 NM (nonmetallic) electrical cable plastic-sheathed cable often referred to as Romex, a trade name. The 12/2 designation refers to its two 12-gauge copper wires—a neutral and a hot. It also holds a bare ground wire. You’ll need 6 feet of cable, including loose wires you’ll cut from this for Step #6.

    7. Ground pigtail connector; cable connector; wire connectors

    8. Wood or plastic cable protector may be required by some municipalities to protect exposed cable. Make from wood or buy as "nonmetallic raceway" in 5-foot lengths.