What is the low beam headlight bulb size for a 1985 Isuzu Impulse?

The 1985 Isuzu Impulse uses a H4656 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 1985 Isuzu Impulse?

The high beam bulb size for the 1985 Isuzu Impulse is H4651 LED.

Why are my 1985 Isuzu Impulse headlights dim?

Dim headlights on a 1985 Isuzu Impulse can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H4656 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1985 Isuzu Impulse fog light?

The 1985 Isuzu Impulse uses a LED Fog Light bulb for the fog light position.

Is the 1985 Isuzu Impulse single or dual beam?

The 1985 Isuzu Impulse uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 1985 Isuzu Impulse?

Yes, the 1985 Isuzu Impulse comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H4656 LED LED conversion kit for the low beams.

Does the 1985 Isuzu Impulse have fog lights?

Yes, the 1985 Isuzu Impulse takes a LED Fog Light bulb for the fog light position.

Did the 1985 Isuzu Impulse change headlight bulb sizes from the previous year?

Yes — the 1985 Isuzu Impulse uses different bulb sizes than the 1984 model. The 1985 generation introduced this bulb configuration.

Is the 1985 Isuzu Impulse the first or last year to use H4656 LED bulbs?

The 1985 Isuzu Impulse is the only year in the 1985 generation to use the H4656 LED bulb for the low beam headlight.

How do I change the headlight on a 1985 Isuzu Impulse?

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 H4656 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 1985 Isuzu Impulse?

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 H4656 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 1985 Isuzu Impulse headlights?

A pair of halogen H4656 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 1985 Isuzu Impulse?

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 H4656 LED position are available as direct plug-and-play replacements.

The 1985 Isuzu Impulse has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 1985 Isuzu Impulse

What Size Bulbs Does a 1985 Isuzu Impulse 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 1985 Isuzu Impulse Have?

Lighting on the 1985 Isuzu Impulse is managed by a total of 12 bulbs, covering everything from primary headlights to signal indicators. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate H4656 LED low beam and H4651 LED high beam bulbs for precise light distribution. This model belongs to the early years of the Impulse's 1984-1992 production span.

Can You Put LED Bulbs in a 1985 Isuzu Impulse?

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 H4656 LED low beams, as they see the most use. Adding a matching H4651 LED LED kit later will complete the look and ensure consistent lighting performance. Don't forget the LED Fog Light fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

1985 Isuzu Impulse Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H4656 LED	Buy H4656 LED →
High Beam	H4651 LED	Buy H4651 LED →
Fog Light	LED Fog Light	Buy LED Fog Light →
Brake Light	158	Buy 158 →
Side Marker	194 LED	Buy 194 LED →
Turn Signal Front	1157 LED	Buy 1157 LED →
Turn Signal Rear	1073 LED	Buy 1073 LED →
Reverse Light	1073	Buy 1073 →
Dome Light	DE3022	Buy DE3022 →
License Plate	194	Buy 194 →
Parking Light	1157	Buy 1157 →
Trunk Light	LED Light	Buy LED Light →

How do the 1985 Isuzu Impulse's bulbs compare to other years?

The 1985 Isuzu Impulse changed bulb sizes from 1984. The previous model year used a different configuration.

The 1986 model switched to a different bulb configuration.

This bulb configuration covers the 1985 model years. ← 1984 1986 →

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Other Impulse Years

1992 1991 1990 1989 1988 1987 1986 1984

Other Vehicles That Use H4656 LED Bulbs

1991 Chrysler New Yorker 1990 Toyota Land Cruiser 1989 Plymouth Gran Fury 1989 Volvo 740 1988 Chrysler LeBaron 1987 Ford Crown Victoria