What is the low beam headlight bulb size for a 1998 Isuzu Trooper?

The 1998 Isuzu Trooper uses a 9004 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 1998 Isuzu Trooper?

The high beam bulb size for the 1998 Isuzu Trooper is N/A.

Why are my 1998 Isuzu Trooper headlights dim?

Dim headlights on a 1998 Isuzu Trooper 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 conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1998 Isuzu Trooper fog light?

The 1998 Isuzu Trooper 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 1998 Isuzu Trooper single or dual beam?

The 1998 Isuzu Trooper uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 1998 Isuzu Trooper?

Yes, the 1998 Isuzu Trooper comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9004 LED conversion kit for the low beams.

Did the 1998 Isuzu Trooper change headlight bulb sizes from the previous year?

Yes — the 1998 Isuzu Trooper uses different bulb sizes than the 1997 model. The 1998 generation introduced this bulb configuration.

Is the 1998 Isuzu Trooper the first or last year to use 9004 bulbs?

The 1998 Isuzu Trooper is the only year in the 1998 generation to use the 9004 bulb for the low beam headlight.

How do I change the headlight on a 1998 Isuzu Trooper?

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 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 1998 Isuzu Trooper?

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

How much does it cost to replace 1998 Isuzu Trooper headlights?

A pair of halogen 9004 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 1998 Isuzu Trooper?

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

The 1998 Isuzu Trooper has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 1998 Isuzu Trooper

What Size Bulbs Does a 1998 Isuzu Trooper 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 1998 Isuzu Trooper Have?

Lighting on the 1998 Isuzu Trooper is managed by a total of 11 bulbs, covering everything from primary headlights to signal indicators. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate 9004 low beam and high beam bulbs for precise light distribution. This model belongs to the late years of the Trooper's 1984-2002 production span.

Can You Put LED Bulbs in a 1998 Isuzu Trooper?

Upgrading to LED is one of the most effective ways to modernize your Isuzu's appearance and safety profile. We recommend starting your upgrade with the 9004 low beams, as they see the most use. Adding a matching LED kit later will complete the look and ensure consistent lighting performance.

1998 Isuzu Trooper Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9004	Buy 9004 →
Turn Signal Front	1157	Buy 1157 →
Side Marker	194	Buy 194 →
License Plate	168	Buy 168 →
Brake Light	1157	Buy 1157 →
Parking Light	1157	Buy 1157 →
Tail Light	1157	Buy 1157 →
Reverse Light	1156	Buy 1156 →
Turn Signal Rear	1156	Buy 1156 →
Dome Light	DE3175	Buy DE3175 →
Map Light	168	Buy 168 →

How do the 1998 Isuzu Trooper's bulbs compare to other years?

The 1998 Isuzu Trooper changed bulb sizes from 1997. The previous model year used a different configuration.

The 1999 model switched to a different bulb configuration.

This bulb configuration covers the 1998 model years. ← 1997 1999 →

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Other Trooper Years

2002 2001 2000 1999 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984

Other Vehicles That Use 9004 Bulbs

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