In outdoor lighting systems, a low voltage transformer converts high voltage power into a current suitable for low voltage lighting fixtures, ensuring their proper operation. However, for someone without experience, installing a low voltage transformer can seem a bit complicated. In this tutorial, we will show you how to properly install a low voltage transformer, so that your outdoor lighting system shines like new. Whether you are an experienced DIY enthusiast or trying outdoor lighting installation for the first time, this easy guide will help you complete the task. Let's get started!


Important Safety Notices

  • Disconnect the power supply of the transformer before installing it.
  • Only use for branch circuits protected by Class A ground-fault circuit interrupters.
  • Use only with landscape lighting systems designed for outdoor use (not suitable for residential units).
  • The suitability of this device as a component of a landscape lighting system shall be determined by CSA or the local governing authority.
  • Install the power unit at least 5 feet away from pools or spas and at least 10 feet away from fountains.
  • If the installation location is in close proximity to pools or spas, connect the unit to a GFCI-protected outlet.
  • Do not use extension cords with this power supply.



  • Screwdriver or socket wrench: Used to remove covers and connect cables.
  • Drill: Used to secure the transformer to the base or wall.
  • Wire cutters: Used to cut cables and connectors.
  • Wire strippers: Used to strip the cable insulation.
  • Gloves and safety goggles: Used to protect personal safety.


Step-by-step Instructions

Step 1: Determine the installation location.
Determine the installation location and ensure that there is an available outlet at the installation location. It is recommended to install a waterproof box on the outlet. Choose a location away from water sources and moist areas, and at least 12 inches above the ground to avoid water infiltration. It is suggested to install on the wall of the garage/backyard/porch.
transformer installation location
Step 2: Secure the transformer to the wall.
Use a power drill or screwdriver to insert load-bearing screws or wall anchors into the wall. Hang the transformer on the screws or wall anchors securely.
secure the transformer to the wall
Step 3: Connect the lighting circuit to the transformer.
Use a flathead screwdriver to adjust the common terminal (marked "COM") and the appropriate low-voltage terminal (marked 12V-15V or 12V-22V). The longer the installation line, prioritize the connection of the low-voltage terminal with the higher voltage. Thread the auxiliary wire cable through the holes in the bottom plate. Separate each pair of wires and strip about 1 inch (1.5 cm) of insulation from each wire. Connect one wire from each pair of wires to the common terminal and the other wire to the corresponding low-voltage terminal. Secure the wires to the terminals by tightening the screws with a flathead screwdriver.
multi-tap low voltage transformer
Step 4: Install a timer/photocell/wifi socket (not mandatory).
Installing a timer/photocell/wifi socket allows the transformer to be automatically turned on or off at specified times or based on the intensity of ambient light. This helps you easily adjust your lighting system and avoid leaving the lights on all night, reducing energy costs.
low voltage outdoor lighting transformer timer
Step 5: Check if it is working.
Connect the power source and the light fixtures, and check if the transformer is working properly.


Congratulations on completing your installation! If you have any questions about this transformer or any other Gardenreet landscape lighting products, please don't hesitate to reach out to us.


How to troubleshoot low voltage transformer issues

  1. Check power connections: Ensure that the transformer is securely and correctly connected to the power source. Check the power cord and plug for any abnormalities and make sure there are no loose or disconnected connections.
  2. Verify power supply: Ensure that the power supply is functioning properly. Check if the main power switch is turned on and inspect for any tripped circuit breakers or blown fuses. Additionally, check if other devices are operating normally to determine if there is an issue with the power supply.
  3. Inspect power wiring: Check for any damaged or disconnected wiring in the circuit connecting to the transformer. You can use a voltmeter to test if there is a current flow in the wiring.
  4. Check overload protector: Low voltage transformers typically have overload protectors. Check if the overload protector has tripped, and if needed, try resetting or replacing the overload protector.
  5. Timer malfunction: The timer may not accurately control the switching of the transformer, causing it to turn on or off at inappropriate times, affecting its normal operation. You can try checking the timer settings and ensure it is functioning properly, or temporarily remove the timer to determine if the issue is related to the timer.
  6. Photocell malfunction: Photocells control the operation of the transformer based on the intensity of light. If the photocell is malfunctioning, it can cause the transformer to not function properly based on light conditions. Check the connections and power supply of the photocell and ensure it is not damaged or misconfigured.
  7. Seek professional assistance: If the above steps do not resolve the issue, it is recommended to contact a professional electrician or transformer repair service who can perform more in-depth troubleshooting and diagnostics. Please remember to prioritize your safety when troubleshooting and avoid attempting repairs beyond your expertise and capabilities.
October 28, 2023 — GardenreetLighting

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