What is the low beam headlight bulb size for a 1990 GMC S-15?

The 1990 GMC S-15 uses a H6054 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 1990 GMC S-15?

The high beam bulb size for the 1990 GMC S-15 is N/A.

Why are my 1990 GMC S-15 headlights dim?

Dim headlights on a 1990 GMC S-15 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 conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1990 GMC S-15 fog light?

The 1990 GMC S-15 typically does not come with factory fog lights in all trim levels. If your vehicle is equipped with them, check the manual as sizes can vary by trim.

Is the 1990 GMC S-15 single or dual beam?

The 1990 GMC S-15 uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 1990 GMC S-15?

Yes, the 1990 GMC S-15 comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H6054 LED conversion kit for the low beams.

Did the 1990 GMC S-15 change headlight bulb sizes from the previous year?

No — the 1990 GMC S-15 uses the same bulb sizes as the 1989 model. This configuration has been consistent across the 1988–1992 generation.

How do I change the headlight on a 1990 GMC S-15?

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 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 1990 GMC S-15?

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 kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 1990 GMC S-15 headlights?

A pair of halogen H6054 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 1990 GMC S-15?

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

The 1990 GMC S-15 shares its bulb sizes with the 1988–1992 generation.

Fitment Guaranteed for 1990 GMC S-15

What Size Bulbs Does a 1990 GMC S-15 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 1990 GMC S-15 Have?

The 1990 GMC S-15 utilizes a refined lighting configuration featuring 4 distinct bulb positions. It features a standard lighting system powered by a dual-bulb halogen configuration using separate H6054 low beam and high beam bulbs for precise light distribution. This model belongs to the late years of the S-15's 1982-1992 production span.

Can You Put LED Bulbs in a 1990 GMC S-15?

For a GMC 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 H6054 low beams, as they see the most use. Adding a matching LED kit later will complete the look and ensure consistent lighting performance.

1990 GMC S-15 Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H6054	Buy H6054 →
Side Marker	194	Buy 194 →
License Plate	194	Buy 194 →
Reverse Light	1156	Buy 1156 →

How do the 1990 GMC S-15's bulbs compare to other years?

The 1990 GMC S-15 uses the same bulbs as the 1989 model.

The 1992 model continues with the same bulb sizes.

This bulb configuration covers the 1988–1992 model years. ← 1989 1992 →

Finding the best installation guide...

Other S-15 Years

1992 1989 1988 1986 1985 1983 1982

Other Vehicles That Use H6054 Bulbs

2020 Chevrolet Express 2500 2020 Chevrolet Express 3500 2016 Ford E350 2015 Ford E-450 Super Duty 2011 Ford E150-E350 2010 Ford F-350 Super Duty