Loading

How to Install Deck Post Cap Lights

Trn Pugh 005 Rail Light Stair Raw
PinterestSave

1) Router a 3/4" deep channel into the 2x4 top rails. This will allow you to hide the low-voltage wire under the top cap. Also router a 3/4" channel down the side of the rail post, closest to the transformer. This will allow you to transfer the wire from under the deck to the top rail. Place the transformer next to the electrical outlet.

2) Drill a hole into the center of the top of your rail posts using a 2" forstner bit. Drill a 1/2" hole from the side of the top rail through the center hole to pull the low-voltage wire through.

3) Run the wire from the transformer to the first light, leaving a 6" loop of wire at the top of the post. Continue the process of threading the wire along the rail through each post, leaving a loop of extra wire at each post. Do not secure the top cap until the lighting system is finished and working.

4) At each post, cut the wire and separate the wires into 2-3" strands. Use a wire stripper to remove about 1/2" of sheathing from each wire and the wires from the light cap.

5) Match the polarity of the wires. One wire will have a smooth black wire and the other will have white lettering or ribbing. Hold the wire ends together and connect them by twisting waterproof wire nuts to create a tight connection. Wrap the connection with electrical tape.

6) Read the instructions for your transformer. Make sure the on/off switch is turned off. Secure the transformer using mounting brackets to its desired location and run the wires into place and connect. Make sure the photo eye sensor is accessible to sunlight.

7) Plug the transformer into the outlet and turn it on. Test the lighting and set the timer as needed.

8) Unplug the transformer and secure the top cap to hide the low-voltage wire. Be careful not to screw into the wire.

Installing Side Mount Deck Lights

1) Router a 3/4" deep channel into the 2x4 top rails. This will allow you to hide the low-voltage wire under the top cap. Also router a 3/4" channel down the side of the rail post closest to the transformer. This will allow you to transfer the wire from under the deck to the top rail. Place the transformer next to the electrical outlet. 

2) Drill a hole into the center of the top of your rail posts using a 2" forstner bit. Drill a 1/2" hole from the side of the top rail through the center hole to pull the low-voltage wire through. Determine the height of the side-mounted lights. This is usually just below the top rail. Drill a 1/2" hole from this location into the center post hole. 

3) Run the wire from the transformer to the first light, leaving a 6" loop of wire at the top of the post. Continue the process of threading the wire along the rail through each post, leaving a loop of extra wire at each post. Do not secure the top cap until the lighting system is finished and working. 

4) At each post, cut the wire and separate the wires into 2-3" strands. Use a wire stripper to remove about 1/2" of sheathing from each wire and the wires from the light cap. 

5) Match the polarity of the wires. One wire will have a smooth black wire and the other will have white lettering and ribbing. Hold the wire ends together and connect them by twisting waterproof wire nuts to create a tight connection. Wrap the connection with electrical tape. 

6) Read the instructions for your transformer. Make sure the on/off switch is turned off. Secure the transformer using mounting brackets to its desired location and run the wires into place and connect. Make sure the photo eye sensor is accessible to sunlight. 

7) Plug the transformer into the outlet and turn it on. Test the lighting and set the timer as needed. 

8) Unplug the transformer and secure the top cap to hide the low-voltage wire. Be careful not to screw into the wire.

Popular Features Articles
Benches, Planters & Skirting

Deck Skirting

Skirting can be an attractive feature that can be added to any low-level deck.

Outdoor Ideas

9 Best Deck Furniture Ideas & Designs

Make your deck the place to be this year. Find unique outdoor furniture ideas for decks of all sizes and transform your backyard into an outdoor living room.

Building

How to Build an Outdoor Table Yourself

Our DIY guide will show you how to build an outdoor table to entertain guests and make the most out of your deck or patio. Learn more with Decks.com.

Next Step: Design Articles
How to Design a Deck

Decking Patterns

Step into the world of deck design and push the limits of your imagination with our collection of deck patterns and ideas. From classic single-width and diagonal layouts to intricate herringbone and chevron designs, we illustrate the wide range of patterns that will unlock your creativity.

How to Design a Deck

Deck Size

Whether remodeling an existing deck or adding a new one to your home, size is one of the most important design elements to consider.

How to Design a Deck

Selecting The Best Composite Decking Color For Your Home

There are many composite decking color options. How do you select the right one for you?

Get more helpful resources delivered right to your inbox

Explore Articles by Topic

Popular Features Articles
Outdoor Ideas

5 Best Ways on How to Hide Trash Cans Outside

Outdoor trash cans can be an unwanted eyesore. Discover how you can easily cover them up and add an extra touch of beauty to your yard.

Building

What Does it Cost to Build a Second Story Deck?

Interested in an elevated deck but asking yourself how much does a second story deck cost? Learn the cost to build a second story deck here.

Building

How to Build an Outdoor Table Yourself

Our DIY guide will show you how to build an outdoor table to entertain guests and make the most out of your deck or patio. Learn more with Decks.com.

Next Step: Design Articles
Pool Decks

Pool Deck Ideas on a Budget

A stylish poolside retreat doesn't have to come with an over-the-top price tag. Allow us to show you some easy and innovative ways to build a stunning pool deck that won't empty your wallet.

How to Design a Deck

Deck Railing Designs

Learn about the newest and most stylish deck railings on the market. Browse pictures of wood, metal, glass, composite and cable rail systems.

How to Design a Deck

Decking Patterns

Step into the world of deck design and push the limits of your imagination with our collection of deck patterns and ideas. From classic single-width and diagonal layouts to intricate herringbone and chevron designs, we illustrate the wide range of patterns that will unlock your creativity.

Get more helpful resources delivered right to your inbox

Explore Articles by Topic