What is the low beam headlight bulb size for a 1999 GMC C3500?

The 1999 GMC C3500 uses a H6054 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 1999 GMC C3500?

The high beam bulb size for the 1999 GMC C3500 is H6054 LED.

Why are my 1999 GMC C3500 headlights dim?

Dim headlights on a 1999 GMC C3500 can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H6054 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1999 GMC C3500 fog light?

The 1999 GMC C3500 uses a H3 LED bulb for the fog light position.

Is the 1999 GMC C3500 single or dual beam?

The 1999 GMC C3500 uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Can I install LED bulbs on my 1999 GMC C3500?

Yes, the 1999 GMC C3500 comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H6054 LED LED conversion kit for the low beams.

Does the 1999 GMC C3500 have fog lights?

Yes, the 1999 GMC C3500 takes a H3 LED bulb for the fog light position.

Did the 1999 GMC C3500 change headlight bulb sizes from the previous year?

Yes — the 1999 GMC C3500 uses different bulb sizes than the 1998 model. The 1999 generation introduced this bulb configuration.

Is the 1999 GMC C3500 the first or last year to use H6054 LED bulbs?

The 1999 GMC C3500 is the only year in the 1999 generation to use the H6054 LED bulb for the low beam headlight.

How do I change the headlight on a 1999 GMC C3500?

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 H6054 LED 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 1999 GMC C3500?

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 H6054 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 1999 GMC C3500 headlights?

A pair of halogen H6054 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 1999 GMC C3500?

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 H6054 LED position are available as direct plug-and-play replacements.

The 1999 GMC C3500 has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 1999 GMC C3500

What Size Bulbs Does a 1999 GMC C3500 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 1999 GMC C3500 Have?

The 1999 GMC C3500 utilizes a refined lighting configuration featuring 14 distinct bulb positions. It features an extensive lighting system powered by a halogen-based setup where a single H6054 LED dual-filament bulb handles both low and high beam duties within the same reflector. This model belongs to the late years of the C3500's 1979-2000 production span.

Can You Put LED Bulbs in a 1999 GMC C3500?

For a GMC built for the road and trail, LED upgrades provide the high-contrast lighting needed for better obstacle detection. Since your C3500 uses a single H6054 LED bulb for both high and low beams, ensure your chosen LED kit is "dual-beam" compatible. This allows the LED circuitry to mimic the two-filament design of the original halogen bulb. Don't forget the H3 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

1999 GMC C3500 Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H6054 LED	Buy H6054 LED →
High Beam	H6054 LED	Buy H6054 LED →
Fog Light	H3 LED	Buy H3 LED →
Brake Light	921 LED	Buy 921 LED →
Side Marker	194 LED	Buy 194 LED →
Turn Signal Front	2357NA LED	Buy 2357NA LED →
Turn Signal Rear	3057 LED	Buy 3057 LED →
Reverse Light	3156	Buy 3156 →
License Plate	194	Buy 194 →
Map Light	168 or 211-2	Buy 168 or 211-2 →
Parking Light	2357NA	Buy 2357NA →
Trunk Light	912	Buy 912 →
Daytime Running	3157CK	Buy 3157CK →
Tail Light	3157CK	Buy 3157CK →

How do the 1999 GMC C3500's bulbs compare to other years?

The 1999 GMC C3500 changed bulb sizes from 1998. The previous model year used a different configuration.

The 2000 model switched to a different bulb configuration.

This bulb configuration covers the 1999 model years. ← 1998 2000 →

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Other C3500 Years

2000 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1986 1985 1984 1983 1982 1981 1980 1979

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