What is the low beam headlight bulb size for a 2010 Mercury Grand Marquis?

The 2010 Mercury Grand Marquis uses a H13 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2010 Mercury Grand Marquis?

The high beam bulb size for the 2010 Mercury Grand Marquis is N/A.

Why are my 2010 Mercury Grand Marquis headlights dim?

Dim headlights on a 2010 Mercury Grand Marquis can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H13 LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2010 Mercury Grand Marquis fog light?

The 2010 Mercury Grand Marquis uses a H10 bulb for the fog light position.

Is the 2010 Mercury Grand Marquis single or dual beam?

The 2010 Mercury Grand Marquis uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2010 Mercury Grand Marquis?

Yes, the 2010 Mercury Grand Marquis comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H13 LED conversion kit for the low beams.

Does the 2010 Mercury Grand Marquis have fog lights?

Yes, the 2010 Mercury Grand Marquis takes a H10 bulb for the fog light position.

Did the 2010 Mercury Grand Marquis change headlight bulb sizes from the previous year?

No — the 2010 Mercury Grand Marquis uses the same bulb sizes as the 2009 model. This configuration has been consistent across the 2008–2010 generation.

Is the 2010 Mercury Grand Marquis the first or last year to use H13 bulbs?

The 2010 Mercury Grand Marquis is the last year in the 2008–2010 generation to use the H13 bulb for the low beam headlight.

How do I change the headlight on a 2010 Mercury Grand Marquis?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old H13 bulb counter-clockwise to remove it, then insert the new bulb and reassemble. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2010 Mercury Grand Marquis?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved H13 LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2010 Mercury Grand Marquis headlights?

A pair of halogen H13 bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 2010 Mercury Grand Marquis?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the H13 position are available as direct plug-and-play replacements.

The 2010 Mercury Grand Marquis is the last model year to use this bulb configuration (2008–2010).

Fitment Guaranteed for 2010 Mercury Grand Marquis

What Size Bulbs Does a 2010 Mercury Grand Marquis Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Easy (Plug and Play)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2010 Mercury Grand Marquis Have?

Lighting on the 2010 Mercury Grand Marquis is managed by a total of 12 bulbs, covering everything from primary headlights to signal indicators. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate H13 low beam and high beam bulbs for precise light distribution.

Can You Put LED Bulbs in a 2010 Mercury Grand Marquis?

Upgrading to LED is one of the most effective ways to modernize your Mercury's appearance and safety profile. We recommend starting your upgrade with the H13 low beams, as they see the most use. Adding a matching LED kit later will complete the look and ensure consistent lighting performance. Don't forget the H10 fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2010 Mercury Grand Marquis Bulb Size Chart

Position	Bulb Size	Shop
Turn Signal Front	3457NA	Buy 3457NA →
Fog Light	H10	Buy H10 →
Low Beam	H13	Buy H13 →
Side Marker	3157CK	Buy 3157CK →
Turn Signal Rear	3157CK	Buy 3157CK →
Parking Light	3457NA	Buy 3457NA →
Tail Light	3157CK	Buy 3157CK →
Brake Light	912	Buy 912 →
Reverse Light	3156	Buy 3156 →
License Plate	168	Buy 168 →
Dome Light	906	Buy 906 →
Map Light	168	Buy 168 →