What is the low beam headlight bulb size for a 1991 GMC Pickup?

The 1991 GMC Pickup uses a 9006 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 1991 GMC Pickup?

The high beam bulb size for the 1991 GMC Pickup is 9005.

Why are my 1991 GMC Pickup headlights dim?

Dim headlights on a 1991 GMC Pickup can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a 9006 LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1991 GMC Pickup fog light?

The 1991 GMC Pickup 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 1991 GMC Pickup single or dual beam?

The 1991 GMC Pickup uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 1991 GMC Pickup?

Yes, the 1991 GMC Pickup comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9006 LED conversion kit for the low beams.

Did the 1991 GMC Pickup change headlight bulb sizes from the previous year?

Yes — the 1991 GMC Pickup uses different bulb sizes than the 1990 model. The 1991 generation introduced this bulb configuration.

Is the 1991 GMC Pickup the first or last year to use 9006 bulbs?

The 1991 GMC Pickup is the only year in the 1991 generation to use the 9006 bulb for the low beam headlight.

How do I change the headlight on a 1991 GMC Pickup?

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 9006 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 1991 GMC Pickup?

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 9006 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 1991 GMC Pickup headlights?

A pair of halogen 9006 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 1991 GMC Pickup?

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 9006 position are available as direct plug-and-play replacements.

The 1991 GMC Pickup has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 1991 GMC Pickup

What Size Bulbs Does a 1991 GMC Pickup 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 1991 GMC Pickup Have?

Owners of the 1991 GMC Pickup will find a total of 8 lighting elements throughout the vehicle's exterior. It features a comprehensive lighting system powered by a dual-bulb halogen configuration using separate 9006 low beam and 9005 high beam bulbs for precise light distribution. This model belongs to the late years of the Pickup's 1973-1991 production span.

Can You Put LED Bulbs in a 1991 GMC Pickup?

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 9006 low beams, as they see the most use. Adding a matching 9005 LED kit later will complete the look and ensure consistent lighting performance.

1991 GMC Pickup Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9006	Buy 9006 →
High Beam	9005	Buy 9005 →
Side Marker	194	Buy 194 →
Brake Light	3057	Buy 3057 →
Turn Signal Rear	3057	Buy 3057 →
License Plate	194	Buy 194 →
Tail Light	3057	Buy 3057 →
Reverse Light	3156	Buy 3156 →

How do the 1991 GMC Pickup's bulbs compare to other years?

The 1991 GMC Pickup changed bulb sizes from 1990. The previous model year used a different configuration.

This bulb configuration covers the 1991 model years. ← 1990

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Other Pickup Years

1990 1989 1988 1987 1986 1985 1983 1982 1981 1980 1978 1977 1976 1975 1974 1973

Other Vehicles That Use 9006 Bulbs

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9006 Comparisons

9005 vs 9006 9006 vs H11 9006 vs HB4