💡Headlight Bulb Size
Mercury Mariner Headlight Bulb Size
Find the correct headlight bulb size for your Mercury Mariner. Covers low beam, high beam, fog lights, and turn signals for all years.
Quick Answer
The Mercury Mariner headlight bulb size depends on the model year and trim. Common sizes include H11 (low beam), 9005/HB3 (high beam), and H16 (fog lights) — see the full breakdown below.
2006-2011
2006-2011Low BeamH11 or H7
High Beam9005/HB3
Fog LightsH16, H11, or 9006 (if equipped)
Turn Signal (Front)7440/T20 or 3157 amber
Headlight TypeHalogen projector or reflector
Notes
- →Never touch halogen bulbs with bare fingers — skin oil causes hot spots and premature failure
- →LED upgrade bulbs are available but may cause CANBUS errors on some models
- →Replace bulbs in pairs — if one side burned out, the other is likely near end of life
2005-2005
2005-2005Low Beam9006/HB4 or H4
High Beam9005/HB3 or H4
Fog Lights9006 or 880/881 (if equipped)
Turn Signal (Front)3157 amber
Headlight TypeHalogen reflector
Notes
- →Never touch halogen bulbs with bare fingers — skin oil causes hot spots and premature failure
- →Replace bulbs in pairs — if one side burned out, the other is likely near end of life
Frequently Asked Questions
- What size headlight bulb does a Mercury Mariner use?
- The Mercury Mariner headlight bulb size varies by year. Newer models often use factory LED units, while older models use H11, H7, or 9006 halogen bulbs. Check the year-specific specs below for your exact fitment.
- Can I put LED bulbs in my Mercury Mariner?
- If your Mercury Mariner has halogen headlights, you can install LED replacement bulbs. Look for bulbs with a proper beam pattern (projector-compatible) to avoid blinding other drivers. Some models may need anti-flicker adapters.
- How do I replace the headlight bulb on a Mercury Mariner?
- On most Mercury Mariner models, you can access the headlight bulb from behind the headlight assembly in the engine bay. Twist the bulb socket counterclockwise, pull out the old bulb, insert the new one (don't touch the glass), and twist back in.
- Why does my Mercury Mariner headlight keep burning out?
- Frequent bulb burnout on the Mercury Mariner is usually caused by a loose connection, moisture in the housing, touching the bulb glass during installation, or a voltage regulator issue. Check the connector and housing seal.
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