Sylvania H4666ST.BX Headlight Bulb - High Beam and Low Beam

Brand	Sylvania H4666ST.BX
Position	High Beam and Low Beam
Voltage	12.80
DOT Approved	Yes
Filament Quantity	2
Street Legal	Yes
Bulb Base Type	A-3
Bulb Type	H4666
Average Rated Life	150
Bulb Material	Glass
Amperage Rating	5.10
Secondary Amperage Rating	3.50
Secondary Wattage	45.00
Bulb Technology	Halogen
Bulb Finish	Clear
Wattage	65.00
Product line	SYLVANIA SilverStar Box
Fits	Chevrolet, Chrysler, Dodge, Ford, Geo, GMC, Mercury, Mitsubishi, Plymouth, Pontiac, Saturn, and Toyota · 104 vehicles

Halogen bulb. Clear glass construction with a 65-watt output.

Street legal. DOT approved for compliant roadway use.

Brighter light. Improves visibility without impacting oncoming drivers.

Cross-references Sylvania H4666ST.BX for the same application. See all 1.

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Sylvania H4666ST.BX Headlight Bulb Overview

The Sylvania H4666ST.BX is a halogen headlight bulb built for drivers who need clearer forward lighting without changing the factory headlamp setup. It is DOT approved and street legal, making it a direct lighting service part for older vehicles with sealed beam headlight systems.

Use this bulb for applications that call for a 12.8V, 65W halogen lamp with an A-3 base and clear glass construction. The SYLVANIA SilverStar Box line is positioned for road-use lighting service, and this part number is commonly searched for sealed beam headlight replacement on Chevrolet Blazer, Ford Probe, and Dodge Dakota applications.

Key Features

Halogen headlight bulb with clear glass construction
12.8-volt electrical rating
65-watt primary wattage with 5.10 amp rating
DOT approved and street legal
A-3 bulb base type
Average rated life: 150 hours
Bulb type: H4666
SYLVANIA SilverStar Box product line

Product Details

The H4666ST.BX is designed for high beam and low beam headlight positions where the vehicle uses a sealed beam-style lighting configuration. Compared with SYLVANIA Basic bulbs, this halogen lamp is engineered to deliver brighter roadway illumination while maintaining visibility for oncoming traffic. The part number H4666ST.BX is also used as a cross-reference identifier for the same application.

This bulb is a fitment-based replacement for a wide range of vehicles, including Fits 1995-1997 Chevrolet Blazer, High Beam and Low Beam; Fits 1994-1997 Chevrolet S10, High Beam and Low Beam; and Fits 1991-1995 Dodge Dakota, High Beam and Low Beam. It also appears in searches for Ford Probe, Pontiac Firebird, and GMC Sonoma headlight bulb replacement.

Common Issues This Bulb Addresses

Dull or dim headlight output
Burned-out sealed beam headlight lamp
Reduced nighttime road visibility
Failed inspection due to nonfunctioning headlamp
Need for a street-legal halogen replacement

Installation Notes and Tips

Confirm the vehicle uses an H4666 bulb specification and sealed beam headlight configuration before ordering. Match the bulb base type and electrical rating to the original lamp, and avoid touching the glass surface during handling. After installation, verify both high beam and low beam operation where the application uses a shared headlamp position.

Fitment examples include Fits 1989-1997 Geo Metro, High Beam and Low Beam; Fits 1991-1997 Pontiac Firebird, High Beam and Low Beam; and Fits 1987-1991 Dodge Daytona, High Beam and Low Beam. Additional vehicle searches often include Chevrolet Blazer, Dodge Dakota, and Ford Probe with sealed beam headlights.

Quality Assurance

This bulb is DOT approved and street legal for road use. SYLVANIA’s SilverStar Box line is built around halogen headlight service applications, and the manufacturer describes this lamp as a brighter-roadway alternative to its Basic bulb line.

This part fits 104 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Submodel	Position	Notes
1997	Chevrolet	Blazer	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1997	Chevrolet	S10	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1997	Ford	Probe	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1997	Geo	Metro	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1997	GMC	Jimmy	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1997	GMC	Sonoma	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1997	Pontiac	Firebird	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1997	Pontiac	Firefly	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1996	Chevrolet	Blazer	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1996	Chevrolet	S10	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1996	Ford	Probe	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1996	Geo	Metro	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1996	GMC	Jimmy	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1996	GMC	Sonoma	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1996	Pontiac	Firebird	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1996	Pontiac	Firefly	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1996	Saturn	SC2	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1995	Chevrolet	Blazer	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1995	Chevrolet	S10	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1995	Dodge	Dakota	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1995	Ford	Probe	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1995	Geo	Metro	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1995	GMC	Jimmy	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1995	GMC	Sonoma	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1995	Pontiac	Firebird	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1995	Pontiac	Firefly	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1995	Saturn	SC2	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1994	Chevrolet	S10	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1994	Dodge	Dakota	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1994	Ford	Probe	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1994	Geo	Metro	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1994	GMC	Sonoma	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1994	Mercury	Capri	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1994	Pontiac	Firebird	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1994	Pontiac	Firefly	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1994	Saturn	SC2	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1994	Toyota	Tercel	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1993	Dodge	Dakota	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1993	Dodge	Stealth	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1993	Ford	Probe	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1993	Geo	Metro	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1993	Mercury	Capri	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1993	Mitsubishi	3000GT	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1993	Pontiac	Firebird	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1993	Saturn	SC2	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1993	Toyota	Tercel	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1992	Chevrolet	Metro	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1992	Chevrolet	Sprint	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1992	Dodge	Caravan	C/V	High Beam and Low Beam	SYLVANIA SilverStar Box
1992	Dodge	Dakota	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1992	Dodge	Stealth	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1992	Geo	Metro	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1992	Mercury	Capri	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1992	Mitsubishi	3000GT	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1992	Pontiac	Firebird	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1992	Saturn	SC	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1992	Toyota	Tercel	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1991	Chevrolet	Sprint	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1991	Chrysler	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Dodge	Caravan	C/V	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Dodge	Dakota	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1991	Dodge	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Dodge	Stealth	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Eagle	Talon	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Geo	Metro	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1991	Mercury	Capri	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Mitsubishi	3000GT	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Mitsubishi	Eclipse	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Plymouth	Laser	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Pontiac	Firebird	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Pontiac	Firefly	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1991	Saturn	SC	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1991	Toyota	Tercel	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1990	Chevrolet	Sprint	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1990	Chrysler	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1990	Dodge	Dakota	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1990	Dodge	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1990	Eagle	Talon	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1990	Geo	Metro	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1990	Mitsubishi	Eclipse	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1990	Plymouth	Laser	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1990	Pontiac	Firefly	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1990	Toyota	Tercel	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1989	Chevrolet	Sprint	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1989	Chrysler	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1989	Dodge	Dakota	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1989	Dodge	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1989	Geo	Metro	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1989	Pontiac	Firefly	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1989	Toyota	Tercel	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1988	Chrysler	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1988	Dodge	Dakota	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1988	Dodge	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1988	Dodge	Shadow	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1988	Plymouth	Sundance	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1988	Pontiac	Firefly	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1988	Toyota	Tercel	—	High Beam and Low Beam	with Sealed Beam Headlights; SYLVANIA SilverStar Box
1987	Chrysler	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1987	Dodge	Dakota	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1987	Dodge	Daytona	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1987	Dodge	Shadow	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1987	Plymouth	Sundance	—	High Beam and Low Beam	SYLVANIA SilverStar Box
1987	Pontiac	Firefly	—	High Beam and Low Beam	with sealed beam headlights; SYLVANIA SilverStar Box
1987	Renault	Alliance	—	High Beam and Low Beam	SYLVANIA SilverStar Box
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Directly replaces or cross-references 1 part number

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

Sylvania — H4666ST.BX

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