Symptoms
- Lights don't turn on at all
- Some fixtures work while others on the same circuit don't
- Lights only work when manually overridden
Likely causes
- CommonTripped GFCI outlet feeding the circuitOutdoor GFCI outlets are prone to tripping from moisture and can cut power to connected fixtures.
- CommonBurned-out bulbThe simplest and most common cause for a single fixture being out.
- PossibleFaulty photocell or timer sensorDusk-to-dawn sensors can fail and keep lights permanently off (or on).
- PossibleLoose or corroded wire connection at the fixtureOutdoor wire connections are exposed to weather and can corrode over time.
What to do
- Check and reset any GFCI outlets on the outdoor circuit, including ones inside a garage that may feed exterior outlets.
- Replace bulbs in affected fixtures with a known-working bulb to rule out a simple burnout.
- If lights use a photocell sensor, cover it during daylight to see if the light responds, indicating a working sensor.
- Check the breaker panel for a tripped breaker dedicated to outdoor lighting.
- Inspect visible wire connections at fixture boxes for corrosion or looseness, turning off power at the breaker first.
- For low-voltage landscape lighting, check the transformer is plugged in and its own breaker/timer settings are correct.
Tools and parts
- Replacement bulbs
- Screwdriver
- Voltage tester
Outdoor light bulb (matching base type)Search: “outdoor light bulb replacement”
Photocell sensorSearch: “outdoor light photocell sensor replacement”
When to call a pro
An electrician should handle any wiring repair on outdoor circuits, especially if you find damaged insulation or exposed wire.
Safety
Use caution
Always shut off power at the breaker before touching wiring inside a fixture, especially in wet or damp conditions.