Sylvania H4666.BX Headlight Bulb - High Beam and Low Beam
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Sylvania
 SYLVANIA Basic Box

Sylvania H4666.BX Headlight Bulb - High Beam and Low Beam

Brand Sylvania H4666.BX
Position High Beam and Low Beam
Voltage 12.80
DOT Approved Yes
Filament Quantity 2
Street Legal Yes
Bulb Base Type A-3
Length 4.76
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 Basic Box
Fits Chevrolet, Chrysler, Dodge, Ford, Geo, GMC, Mercury, Mitsubishi, Plymouth, Pontiac, Saturn, and Toyota · 104 vehicles

Halogen bulb. Clear glass design delivers bright, road-ready lighting.

DOT approved. Street-legal performance for dependable exterior lighting.

XtraVision® lighting. Brighter roadway visibility than SYLVANIA Basic bulbs.

Cross-references Sylvania H4666.BX for the same application. See all 1.

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Sylvania H4666.BX Headlight Bulb Overview

The Sylvania H4666.BX is a 12.8V halogen headlight bulb built for sealed beam headlight applications that use an H4666 bulb type. It is DOT approved and street legal, with clear glass construction and a dual-filament design for high beam and low beam use.

For drivers servicing older vehicles such as the Chevrolet Blazer, Ford Probe, or Toyota Tercel, this bulb provides a direct lighting replacement for select sealed beam setups. The SYLVANIA Basic Box line focuses on straightforward OE-style lighting service for everyday road use.

Key Features

  • Halogen headlight bulb with clear glass construction
  • 12.8-volt electrical rating
  • 65-watt output with 5.10 amp rating
  • Dual-filament design for high beam and low beam operation
  • DOT approved and street legal
  • Bulb type H4666 with A-3 base
  • Average rated life: 150 hours
  • Part number H4666.BX for catalog lookup and ordering

Detailed Description

Sylvania H4666.BX is a halogen headlight bulb engineered for select vehicles that use sealed beam headlight systems. It is listed for high beam and low beam positions across a wide range of older cars and light trucks, including the 1995-1997 Chevrolet Blazer, 1994-1997 Chevrolet S10, 1993-1997 Ford Probe, 1988-1994 Toyota Tercel, and 1991-1995 Dodge Dakota. The bulb uses a dual-filament layout and a clear glass envelope to deliver roadway illumination in a legal, road-ready format. The part number H4666.BX is also useful when cross-checking service records or matching an existing bulb reference.

This part cross-references Sylvania H4666.BX for the same application.

What It Helps Address

  • Dim or aging headlight output on sealed beam-equipped vehicles
  • Failed high beam or low beam function in supported applications
  • Restoration of road-legal forward lighting performance
  • Replacement needs for halogen headlamp service on older models
  • Bulb identification issues when matching H4666.BX by part number

Installation Notes and Tips

Verify the vehicle uses an H4666 bulb type and sealed beam headlight configuration before installation. Confirm the bulb base type, voltage, and wattage match the original specification, and handle the glass bulb carefully to avoid contamination or damage. For fitment, this part installs in high beam and low beam positions on supported vehicles such as the Chevrolet Blazer, Ford Probe, and Toyota Tercel.

Quality Assurance

This Sylvania halogen bulb is DOT approved and street legal, supporting compliant use on public roads when installed in the correct application. The SYLVANIA Basic Box line provides a practical lighting replacement option for select older vehicles requiring H4666 headlight service.

Related reading

This part fits 104 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelPositionNotes
1997ChevroletBlazer—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1997ChevroletS10—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1997FordProbe—High Beam and Low BeamSYLVANIA Basic Box
1997GeoMetro—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1997GMCJimmy—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1997GMCSonoma—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1997PontiacFirebird—High Beam and Low BeamSYLVANIA Basic Box
1997PontiacFirefly—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1996ChevroletBlazer—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1996ChevroletS10—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1996FordProbe—High Beam and Low BeamSYLVANIA Basic Box
1996GeoMetro—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1996GMCJimmy—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1996GMCSonoma—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1996PontiacFirebird—High Beam and Low BeamSYLVANIA Basic Box
1996PontiacFirefly—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1996SaturnSC2—High Beam and Low BeamSYLVANIA Basic Box
1995ChevroletBlazer—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1995ChevroletS10—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1995DodgeDakota—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1995FordProbe—High Beam and Low BeamSYLVANIA Basic Box
1995GeoMetro—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1995GMCJimmy—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1995GMCSonoma—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1995PontiacFirebird—High Beam and Low BeamSYLVANIA Basic Box
1995PontiacFirefly—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1995SaturnSC2—High Beam and Low BeamSYLVANIA Basic Box
1994ChevroletS10—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1994DodgeDakota—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1994FordProbe—High Beam and Low BeamSYLVANIA Basic Box
1994GeoMetro—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1994GMCSonoma—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1994MercuryCapri—High Beam and Low BeamSYLVANIA Basic Box
1994PontiacFirebird—High Beam and Low BeamSYLVANIA Basic Box
1994PontiacFirefly—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1994SaturnSC2—High Beam and Low BeamSYLVANIA Basic Box
1994ToyotaTercel—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1993DodgeDakota—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1993DodgeStealth—High Beam and Low BeamSYLVANIA Basic Box
1993FordProbe—High Beam and Low BeamSYLVANIA Basic Box
1993GeoMetro—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1993MercuryCapri—High Beam and Low BeamSYLVANIA Basic Box
1993Mitsubishi3000GT—High Beam and Low BeamSYLVANIA Basic Box
1993PontiacFirebird—High Beam and Low BeamSYLVANIA Basic Box
1993SaturnSC2—High Beam and Low BeamSYLVANIA Basic Box
1993ToyotaTercel—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1992ChevroletMetro—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1992ChevroletSprint—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1992DodgeCaravanC/VHigh Beam and Low BeamSYLVANIA Basic Box
1992DodgeDakota—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1992DodgeStealth—High Beam and Low BeamSYLVANIA Basic Box
1992GeoMetro—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1992MercuryCapri—High Beam and Low BeamSYLVANIA Basic Box
1992Mitsubishi3000GT—High Beam and Low BeamSYLVANIA Basic Box
1992PontiacFirebird—High Beam and Low BeamSYLVANIA Basic Box
1992SaturnSC—High Beam and Low BeamSYLVANIA Basic Box
1992ToyotaTercel—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1991ChevroletSprint—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1991ChryslerDaytona—High Beam and Low BeamSYLVANIA Basic Box
1991DodgeCaravanC/VHigh Beam and Low BeamSYLVANIA Basic Box
1991DodgeDakota—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1991DodgeDaytona—High Beam and Low BeamSYLVANIA Basic Box
1991DodgeStealth—High Beam and Low BeamSYLVANIA Basic Box
1991EagleTalon—High Beam and Low BeamSYLVANIA Basic Box
1991GeoMetro—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1991MercuryCapri—High Beam and Low BeamSYLVANIA Basic Box
1991Mitsubishi3000GT—High Beam and Low BeamSYLVANIA Basic Box
1991MitsubishiEclipse—High Beam and Low BeamSYLVANIA Basic Box
1991PlymouthLaser—High Beam and Low BeamSYLVANIA Basic Box
1991PontiacFirebird—High Beam and Low BeamSYLVANIA Basic Box
1991PontiacFirefly—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1991SaturnSC—High Beam and Low BeamSYLVANIA Basic Box
1991ToyotaTercel—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1990ChevroletSprint—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1990ChryslerDaytona—High Beam and Low BeamSYLVANIA Basic Box
1990DodgeDakota—High Beam and Low BeamSYLVANIA Basic Box
1990DodgeDaytona—High Beam and Low BeamSYLVANIA Basic Box
1990EagleTalon—High Beam and Low BeamSYLVANIA Basic Box
1990GeoMetro—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1990MitsubishiEclipse—High Beam and Low BeamSYLVANIA Basic Box
1990PlymouthLaser—High Beam and Low BeamSYLVANIA Basic Box
1990PontiacFirefly—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1990ToyotaTercel—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1989ChevroletSprint—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1989ChryslerDaytona—High Beam and Low BeamSYLVANIA Basic Box
1989DodgeDakota—High Beam and Low BeamSYLVANIA Basic Box
1989DodgeDaytona—High Beam and Low BeamSYLVANIA Basic Box
1989GeoMetro—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1989PontiacFirefly—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1989ToyotaTercel—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1988ChryslerDaytona—High Beam and Low BeamSYLVANIA Basic Box
1988DodgeDakota—High Beam and Low BeamSYLVANIA Basic Box
1988DodgeDaytona—High Beam and Low BeamSYLVANIA Basic Box
1988DodgeShadow—High Beam and Low BeamSYLVANIA Basic Box
1988PlymouthSundance—High Beam and Low BeamSYLVANIA Basic Box
1988PontiacFirefly—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1988ToyotaTercel—High Beam and Low Beamwith Sealed Beam Headlights; SYLVANIA Basic Box
1987ChryslerDaytona—High Beam and Low BeamSYLVANIA Basic Box
1987DodgeDakota—High Beam and Low BeamSYLVANIA Basic Box
1987DodgeDaytona—High Beam and Low BeamSYLVANIA Basic Box
1987DodgeShadow—High Beam and Low BeamSYLVANIA Basic Box
1987PlymouthSundance—High Beam and Low BeamSYLVANIA Basic Box
1987PontiacFirefly—High Beam and Low Beamwith sealed beam headlights; SYLVANIA Basic Box
1987RenaultAlliance—High Beam and Low BeamSYLVANIA Basic Box
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Sylvania — H4666.BX