How to Test Landscape Lights with a Multimeter: 2024 Simple Guide

It is important to know how to test landscape lights with a multimeter. First, set it to the voltage measurement mode. Connect the multimeter’s probes to the light’s positive and negative terminals. If the multimeter shows a voltage reading within the light’s specified range, it indicates proper functionality. Otherwise, troubleshooting may be required.

What are Landscape Lights?

Landscape lights are fixtures designed to enhance outdoor spaces’ aesthetic appeal and functionality. They are strategically placed in gardens, pathways, driveways, or other outdoor areas to illuminate landscaping features, improve visibility, and create a desired ambiance.

Landscape lights come in various types, such as spotlights, pathway lights, deck lights, and floodlights, and can utilize different technologies, including LED, solar-powered, or low-voltage systems.

Steps on How to Test Landscape Lights with a Multimeter

Testing landscape lights with a multimeter is a straightforward process that can help identify electrical issues or malfunctions. Following these steps, you can effectively know how to test landscape lights with a multimeter:

How to Test Landscape Lights with a Multimeter

Step 1: Gather the Necessary Tools

Before you begin testing, gather the following tools:

  • Multimeter: A digital multimeter capable of measuring voltage.
  • Test leads: The multimeter typically comes with detachable test leads or probes.
  • Safety gear: Wear appropriate safety gear, such as safety glasses and gloves, to protect yourself during the process.

Step 2: Set the Multimeter

Set your multimeter to the voltage measurement mode. Depending on the model, you may have a separate setting for AC (alternating current) and DC (direct current) voltage. Select the appropriate setting based on the landscape lights’ electrical specifications.

Step 3: Prepare the Landscape Light

Ensure the landscape light you want to test is properly working. Check for any loose connections, damaged wires, or other visible signs of damage. Ensure the light is securely attached to its mounting and all components are intact.

Step 4: Turn on the Power

Switch on the power supply that provides electricity to the landscape lights. This can be done using a switch on the transformer or power source connected to the lights. It is essential to have power running through the lights to perform accurate testing.

Step 5: Identify the Positive and Negative Terminals

Identify the landscape light’s positive (+) and negative (-) terminals. In most cases, the positive terminal is connected to the light’s red wire, while the negative terminal is connected to the black wire. However, refer to the light’s manual or manufacturer’s instructions to confirm the wiring configuration.

Step 6: Connect the Multimeter

Take the red test lead from your multimeter and connect it to the positive terminal of the landscape light. Similarly, connect the black test lead to the negative terminal. Ensure that the test leads have a secure connection to the terminals, as loose connections can affect the accuracy of the readings.

Step 7: Read the Voltage

Once the multimeter is properly connected, read the voltage on its screen. The reading will indicate the voltage being supplied to the landscape light. Compare this value to the light’s specified operating voltage range. If the multimeter displays a voltage within the specified range, it suggests that the light receives the correct power supply.

How to Test Landscape Lights with a Multimeter

Step 8: Check for Variations

While monitoring the multimeter reading, observe if there are any significant variations or fluctuations in voltage. Variations in voltage could indicate issues such as unstable power supply or wiring problems. Ideally, the voltage reading should remain stable within the specified range.

Step 9: Perform Multiple Tests

To ensure accurate results, it’s recommended to perform multiple tests. Disconnect the multimeter leads from the landscape light and reconnect them to retest the voltage. This helps verify the consistency of the readings and eliminates the possibility of any temporary fluctuations.

Step 10: Troubleshooting

If the multimeter reading is outside the specified voltage range or you encounter any other issues, you may need to troubleshoot the landscape light. Start by checking the connections between the light and power source. 

Look for loose wires, damaged cables, or corroded terminals. Additionally, inspect the light’s components for signs of damage or wear. Address any identified problems accordingly.

Step 11: Safety Precautions

Ensure that safety precautions are followed throughout the testing process. Avoid contact with live wires, and always carefully handle the multimeter and test leads. If unsure about any aspect of the process, consult a qualified electrician for assistance.

Following these steps, you can effectively test landscape lights using a multimeter. Remember that proper maintenance and regular testing can help identify and resolve electrical issues promptly, ensuring the functionality and longevity of your landscape lighting system. So now you know, how to test landscape lights with a multimeter?

Troubleshooting Tips for Low-Voltage Lighting System

Troubleshooting a low-voltage lighting system can help identify and resolve issues that may affect its functionality. Here are some tips to guide you through the troubleshooting process.

How to Test Landscape Lights with a Multimeter

1. Check Power Supply

  • Verify that the power supply, such as the transformer, is properly connected and receiving power.
  • Ensure the power supply provides the voltage output for the low-voltage lighting system. Use a multimeter to measure the voltage at the transformer’s output terminals.

2. Inspect Wiring Connections

  • Inspect all wiring connections in the lighting system, including connections at the transformer, fixtures, and junction boxes.
  • Look for loose or corroded connections and ensure that all connections are securely tightened.

3. Examine the Transformer

  • Inspect the transformer for any visible damage, such as melted or frayed wires, burnt smell, or signs of water intrusion.
  • Check if the transformer is properly sized for the lighting system’s load. Ensure the transformer’s wattage rating sufficiently powers all the connected fixtures.

4. Test the Transformer

  • Measure the voltage output of the transformer. Ensure that it matches the specified output voltage.
  • If the transformer’s output voltage is incorrect or fluctuating, it may indicate a faulty transformer that needs to be replaced.

5. Assess Individual Fixtures

  • Examine each lighting fixture in the system. Look for any visible damage, such as broken lenses, loose wires, or corroded contacts.
  • Check if the bulbs in the fixtures are properly seated and functioning. Replace any burned-out or damaged bulbs with new ones.

6. Verify the Bulbs

  • Test the bulbs using a multimeter or swapping them with known working bulbs from another fixture.
  • Ensure that the bulbs are securely connected and compatible with the fixture’s voltage requirements.

7. Inspect the Wiring

  • Inspect the low-voltage wiring for visible damage, such as cuts, nicks, or exposed wires.
  • Pay close attention to areas where the wiring is exposed to the elements, such as above-ground sections or connections near water sources.

8. Troubleshoot Voltage Drops

  • If certain fixtures appear dimmer than others or fail to illuminate, there may be a voltage drop issue.
  • Check for loose or damaged wiring connections, undersized wires, or excessive wire length that can contribute to voltage drops. Consider using thicker wire or shorter wire runs if necessary.

9. Utilize Voltage Taps

  • If the lighting system is extensive with long wire runs, consider using voltage taps or additional transformers to divide the system into multiple zones.
  • Voltage taps help distribute power more evenly and reduce voltage drops over long distances.

10. Inspect Photocells and Timers

  • If the low-voltage lighting system has photocells or timers, ensure it functions correctly.
  • If applicable, check the settings, replace batteries, and ensure they are properly installed and wired into the system.

11. Address Underground Wiring Issues

  • If the low-voltage wiring is buried underground, check for any signs of damage or disruption, such as digging or rodent activity.
  • Repair any damaged sections and consider using conduit or protective sleeves for added durability.

12. Seek Professional Assistance

  • If you encounter persistent issues or are unsure about the troubleshooting process, consult a professional electrician or landscape lighting specialist for further assistance.

Remember to always follow safety guidelines and disconnect the power supply before troubleshooting or repairing. 

If you want to know How to Test a Transmission Speed Sensor with a Multimeter? Read my complete blog.


How do you test low-voltage landscape wires?

To test low-voltage landscape wires, set your multimeter to voltage measurement mode, strip a small section of the wire’s insulation, and touch the multimeter probes to the exposed wire ends. Ensure the power is on and read the voltage on the multimeter.

What is the voltage of landscape lighting?

Landscape lighting voltage is typically low, ranging from 12 to 24 volts. This low voltage is safer for outdoor installations and reduces the risk of electrical shock.

Are landscape lights AC or DC?

Landscape lights can be AC (alternating current) or DC (direct current). However, low-voltage landscape lighting systems commonly use AC transformers to decrease the voltage from the main power source to a safer level, usually 12 volts.

What causes a voltage drop in landscape lighting?

The wiring resistance primarily causes a voltage drop in landscape lighting. The resistance increases over long wire runs or when using thin-gauge wires, resulting in a voltage drop. Other factors, such as inadequate transformer capacity or poor connections, can also contribute to voltage drop.


It is essential to know how to test landscape lights with a multimeter to ensure their proper functionality. Following the outlined steps, which include setting the multimeter, connecting the probes to the light’s terminals, and reading the voltage, you can assess if the lights receive the correct power supply.

Troubleshooting any issues based on the test results will help maintain and optimize the performance of your landscape lighting system. Remember to prioritize safety throughout the testing process and consult professionals if needed.