What is the low beam headlight bulb size for a 1991 Cadillac Allante?

The 1991 Cadillac Allante uses a 9004 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 1991 Cadillac Allante?

The high beam bulb size for the 1991 Cadillac Allante is 9004 LED.

Why are my 1991 Cadillac Allante headlights dim?

Dim headlights on a 1991 Cadillac Allante can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a 9004 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1991 Cadillac Allante fog light?

The 1991 Cadillac Allante uses a H3 LED bulb for the fog light position.

Is the 1991 Cadillac Allante single or dual beam?

The 1991 Cadillac Allante 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 1991 Cadillac Allante?

Yes, the 1991 Cadillac Allante comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9004 LED LED conversion kit for the low beams.

Does the 1991 Cadillac Allante have fog lights?

Yes, the 1991 Cadillac Allante takes a H3 LED bulb for the fog light position.

How do I change the headlight on a 1991 Cadillac Allante?

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 9004 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 1991 Cadillac Allante?

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 9004 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 1991 Cadillac Allante headlights?

A pair of halogen 9004 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 1991 Cadillac Allante?

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 9004 LED position are available as direct plug-and-play replacements.

This vehicle is part of the 1988–1993 Cadillac Allante generation. All models in this range share identical light bulb sizes.

Fitment Guaranteed for 1991 Cadillac Allante

What Size Bulbs Does a 1991 Cadillac Allante 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 Cadillac Allante Have?

The 1991 Cadillac Allante utilizes a refined lighting configuration featuring 13 distinct bulb positions. It features an extensive lighting system powered by a halogen-based setup where a single 9004 LED dual-filament bulb handles both low and high beam duties within the same reflector. This model belongs to the mid years of the Allante's 1988-1993 production span.

Can You Put LED Bulbs in a 1991 Cadillac Allante?

Upgrading to LED is one of the most effective ways to modernize your Cadillac's appearance and safety profile. Since your Allante uses a single 9004 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.

1991 Cadillac Allante Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9004 LED	Buy 9004 LED →
High Beam	9004 LED	Buy 9004 LED →
Fog Light	H3 LED	Buy H3 LED →
Brake Light	892 LED	Buy 892 LED →
Side Marker	194 LED	Buy 194 LED →
Turn Signal Front	2057NA LED	Buy 2057NA LED →
Turn Signal Rear	2057 LED	Buy 2057 LED →
Dome Light	906	Buy 906 →
License Plate	97	Buy 97 →
Map Light	906	Buy 906 →
Parking Light	2057NA	Buy 2057NA →
Reverse Light	1156	Buy 1156 →
Trunk Light	1003	Buy 1003 →

Installation Guide

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Other Allante Years

1993 1992 1990 1989 1988

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