Spring Landscape Lighting Maintenance: 7 Checks for Michigan Homes

Published April 29, 2026 by LandscapeLightMI

Quick answer: A Michigan landscape lighting system needs a spring tune-up every year. Snow load, salt, frost heave, and lawn equipment all take their toll. Plan to inspect transformer connections, test voltage at every fixture, replace failed lamps, clean lenses, re-bury wire that frost pushed up, re-aim fixtures, and reset the timer. Most systems take a focused afternoon.

Michigan winters are hard on outdoor lighting. Between freeze-thaw cycles in Oakland County, road salt creeping into landscape beds in places like Bloomfield Hills and Birmingham, and the occasional 16-inch snow dump on West Michigan, your low-voltage system goes through a lot from December through March. A short, structured spring service brings everything back to spec before the patio season starts and stops small problems from turning into expensive ones.

This walkthrough is what we run on our own client maintenance visits. Work through it in order. If something on the list doesn't apply to your setup, skip it. If you hit a problem you're not sure about, the bottom of the post has a no-pressure way to get a second set of eyes on the system.

Before You Start: Gather a Few Tools

You don't need much, but the right tools make the job ten times faster:

A multimeter that reads AC volts down to the tenth of a volt
A small ratcheting screwdriver and a pair of needle-nose pliers
Replacement bulbs that match your fixtures (MR16, G4, or whatever your system uses)
Dielectric grease or silicone-filled wire connectors
A flathead garden tool for re-burying wire
A microfiber rag and a spray bottle of plain water (no harsh cleaners on aluminum or brass)

Pick a dry afternoon when the ground has thawed and the lawn is dry enough to walk without leaving footprints. Mid-to-late April through early May is the sweet spot in southern Michigan.

The 7 Spring Checks Every System Needs

1. Inspect the Transformer Cabinet

Open the transformer (always cut power at the breaker first). Look for moisture, mouse activity, corrosion on the secondary terminals, and loose wire nuts. Tighten every terminal screw a quarter turn. Mice love a warm transformer in February, and chewed insulation is the most common cause of a system that "won't power up" in spring.

If you see green or white powder on copper terminals, that's oxidation from humidity. Clean with a wire brush and apply a thin film of dielectric grease before reconnecting.

2. Test Voltage at the First and Last Fixtures on Every Run

This is the single most important diagnostic. Set your multimeter to AC volts. Measure at the closest fixture on each run, then walk to the farthest fixture on the same run. The reading at the far fixture should be within 1.5 to 2 volts of the close fixture, and both should be within the operating range of your bulbs (usually 10.5 to 12.5 volts for 12V LED systems).

If the far fixture is way under spec, you have voltage drop. Causes: undersized wire for the run length, too many fixtures on one run, corroded splice, or the transformer tap is set too low. Bumping from the 12V tap to the 13V or 14V tap often solves it cleanly.

3. Replace Failed Lamps and Convert Halogens to LED

Walk every fixture at dusk and note the dim ones, the dark ones, and the ones that flicker. Halogens dim and yellow as they age, so even a working halogen at year five is throwing maybe 60 percent of its original output. If you still have halogens, this is the year to upgrade. LED MR16 retrofits in the 2700K to 3000K range match the warm halogen look without the heat or the watt draw. See our overview of low-voltage vs high-voltage landscape lighting for the system-level differences.

4. Clean Lenses, Reflectors, and Fixture Bodies

A film of pollen, hard water spots, and pine sap can knock 20 percent off a fixture's effective output. Wipe lenses with plain water and a microfiber rag. For brass and copper fixtures, a dab of mineral oil after cleaning slows oxidation. Skip household cleaners. They eat the powder coat on aluminum and dull the patina on brass.

5. Re-bury Cable and Reseat Frost-Heaved Fixtures

Walk the cable runs. Frost heave pushes wire up through mulch and lawn every year, especially in clay-heavy areas of Oakland and Macomb counties. Use a flathead spade or a wire installation tool to reseat the cable to 4 to 6 inches deep. While you're walking, push any tilted path light or uplight back to vertical and confirm the fixture spike is fully seated in firm soil.

6. Re-aim Every Uplight and Spotlight

Plant growth, fixture creep, and snow load shift the aim of every accent fixture over a year. Wait until dusk and walk the property with the lights on. Confirm uplights are catching the trunk and key branches you want featured, downlights are washing the area you intended, and path lights are pointing straight down with no glare into the eye line. A 5-degree adjustment can be the difference between a sharp scene and a flat one.

7. Reset the Timer and Replace the Backup Battery

Astronomic timers track sunrise and sunset by date and location, but a power outage during a winter storm can reset the clock or wipe the schedule. Verify date, time, location, and that dusk-to-dawn or your scheduled mode is correct. If the backup battery is older than two years, replace it. A $4 battery saves you from a black yard the next time the grid blinks.

What to Do If You Find Bigger Problems

Some things are beyond a normal spring tune-up. If you uncover any of the following, get a professional involved before you make it worse.

Tripped GFCI that won't reset. Could be a buried short. Trying to bypass the GFCI is dangerous and a code violation.
Browned or melted wire insulation inside the transformer. The transformer or one of its windings may be failing. Replace, don't patch.
Multiple fixtures dead on the same run after voltage testing. Likely a buried splice failure. Finding it without a fault locator is brutal.
Underground cable damage from a contractor or rodent. Splice repair, in-line waterproof connectors, and a re-test of the run.

If you're somewhere in Oakland County, the team at LandscapeLightMI handles these calls regularly. We'll come out, run the diagnostics, and give you a written estimate. Take a look at our full list of services or our custom design plans if you're thinking about expanding the system this season.

Spring Is Also the Best Time to Add to a System

If your system was installed before LED fixtures got really good (call it pre-2018), you might be running an older transformer that's running near full load. Adding a new uplight cluster on the back of the house or a path lighting run to a side garden is much easier when we're already on site for the spring service. Wire pulls, transformer upgrades, and new control modules all go faster while the ground is soft and before the lawn is at peak growth.

Some of the most common spring add-ons we see across Bloomfield Hills, Birmingham, Rochester Hills, and Troy:

Tree uplights for newly mature trees that are now worth featuring
Hardscape and step lights for safety on patios and stairs that got finished last summer
Smart-control upgrades (Wi-Fi or Bluetooth scene control)
Color-changing accent zones for holidays
Driveway and gate uplighting for curb appeal

Frequently Asked Questions

When should I do spring landscape lighting maintenance in Michigan?

Wait until the ground has thawed and overnight lows are reliably above freezing, usually mid-to-late April in southern Michigan and early May further north. Doing the work too early risks brittle plastic, frozen connectors, and stepping on soft, recovering turf. Aim for a dry afternoon with temperatures in the 50s.

Why are my low-voltage lights dim after winter?

Three common culprits in Michigan: corroded socket contacts from snowmelt and salt, water intrusion at wire splices that has raised resistance, and a transformer tap that no longer matches your run lengths. A quick voltage drop test at the farthest fixture tells you which one you're dealing with.

Should I replace halogen landscape bulbs with LED in spring?

If your fixtures still take MR16 or G4 halogen bulbs, swapping to integrated LED retrofits or LED-rated fixtures is one of the highest-return upgrades you can make. Expect 75 to 85 percent less energy use, 5 to 10 times the lifespan, and far less heat damage to lens gaskets and plant material.

Do I need to reset my landscape lighting timer in spring?

Yes. Astronomic timers track sunrise and sunset, but a power outage during a winter storm often resets the clock or forgets the schedule. Verify the date and time, confirm the dusk-to-dawn or scheduled mode is correct, and replace the backup battery if it's older than two years.

How often should landscape lighting be professionally serviced?

Most Oakland County and West Michigan systems benefit from one professional service visit per year, ideally in spring. The technician checks transformer load, voltage at every fixture, replaces failed lamps or LED modules, cleans lenses, repositions fixtures the snow plow shifted, and reseals exposed splices.

Is it worth re-aiming the fixtures in spring?

Almost always. Frost heave, snow load, lawn care equipment, and a year of plant growth all shift fixtures away from their original aim. Re-aiming uplights, path lights, and spotlights restores the design intent and is the difference between a system that looks great and one that looks tired.

Want a pro to handle the spring tune-up?

We service systems across Oakland County, Macomb, and West Michigan. Voltage testing, lamp replacement, re-aim, and a written report.

Book a Spring Service Visit

About the author: LandscapeLightMI designs, installs, and services low-voltage landscape lighting across Oakland County, Macomb County, and West Michigan. Our crew has installed thousands of fixtures over the past 12 years and we maintain hundreds of systems annually. Sources: Illuminating Engineering Society RP-33 Lighting for Exterior Environments; National Electrical Code Article 411 (low-voltage lighting systems).