What is the low beam headlight bulb size for a 2018 Ram 4500?

The 2018 RAM 4500 uses a H11 LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2018 Ram 4500?

The high beam bulb size for the 2018 RAM 4500 is 9005 LED.

Why are my 2018 Ram 4500 headlights dim?

Dim headlights on a 2018 RAM 4500 can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H11 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2018 Ram 4500 fog light?

The 2018 RAM 4500 uses a 9006 LED bulb for the fog light position.

Is the 2018 Ram 4500 single or dual beam?

The 2018 RAM 4500 uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2018 Ram 4500?

Yes, the 2018 RAM 4500 comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H11 LED LED conversion kit for the low beams.

Does the 2018 Ram 4500 have fog lights?

Yes, the 2018 RAM 4500 takes a 9006 LED bulb for the fog light position.

Did the 2018 Ram 4500 change headlight bulb sizes from the previous year?

No — the 2018 RAM 4500 uses the same bulb sizes as the 2017 model. This configuration has been consistent across the 2016–2018 generation.

Is the 2018 Ram 4500 the first or last year to use H11 LED bulbs?

The 2018 RAM 4500 is the last year in the 2016–2018 generation to use the H11 LED bulb for the low beam headlight.

How do I change the headlight on a 2018 Ram 4500?

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 H11 LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. Note: RAM vehicles use a CANbus system, so LED replacements may need an anti-flicker decoder. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2018 Ram 4500?

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 H11 LED 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 2018 Ram 4500 headlights?

A pair of halogen H11 LED 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 2018 Ram 4500?

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 H11 LED position are available as direct plug-and-play replacements. Since the RAM uses CANbus monitoring, choose a CANbus-compatible LED kit to avoid dashboard errors.

The 2018 RAM 4500 is the last model year to use this bulb configuration (2016–2018).

Fitment Guaranteed for 2018 RAM 4500

What Size Bulbs Does a 2018 RAM 4500 Use?

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

Installation Difficulty

Moderate (Dust covers often present)

Est. Replacement Cost

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

What Lighting System Does the 2018 RAM 4500 Have?

The 2018 RAM 4500 utilizes a refined lighting configuration featuring 12 distinct bulb positions. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate H11 LED low beam and 9005 LED high beam bulbs for precise light distribution. This model belongs to the mid years of the 4500's 2011-2022 production span. Note that RAM vehicles typically feature a CANbus electrical monitor that checks for specific bulb resistance.

LED Flicker Warning

This vehicle is known to use a CANbus system. Installing standard LEDs may cause flickering.

Use a CANbus decoder.

Can You Put LED Bulbs in a 2018 RAM 4500?

For a RAM built for the road and trail, LED upgrades provide the high-contrast lighting needed for better obstacle detection. We recommend starting your upgrade with the H11 LED low beams, as they see the most use. Adding a matching 9005 LED LED kit later will complete the look and ensure consistent lighting performance. Because RAM utilizes a CANbus system, standard LED bulbs may cause "bulb out" errors on your dashboard. Always opt for "Error-Free" or CANbus-ready kits which include the necessary resistors. Don't forget the 9006 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2018 RAM 4500 Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H11 LED	Buy H11 LED →
High Beam	9005 LED	Buy 9005 LED →
Fog Light	9006 LED	Buy 9006 LED →
Brake Light	921 LED	Buy 921 LED →
Side Marker	3057K LED	Buy 3057K LED →
Turn Signal Front	3157NA LED	Buy 3157NA LED →
Turn Signal Rear	3057K LED	Buy 3057K LED →
License Plate	194	Buy 194 →
Map Light	578	Buy 578 →
Parking Light	3157NA	Buy 3157NA →
Reverse Light	921 or 7440	Buy 921 or 7440 →
Trunk Light	921	Buy 921 →

How do the 2018 RAM 4500's bulbs compare to other years?

The 2018 RAM 4500 uses the same bulbs as the 2017 model.

The 2019 model switched to a different bulb configuration.

This bulb configuration covers the 2016–2018 model years. ← 2017 2019 →

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Other 4500 Years

2022 2021 2019 2017 2016 2015 2014 2013 2012 2011

Other Vehicles That Use H11 LED Bulbs

2023 Honda Odyssey 2023 Nissan Maxima 2023 Nissan Murano 2023 Toyota 4Runner 2023 Toyota Tacoma 2022 Ford F-250