HomeElectrical, Lighting and Body > Lighting - ExteriorTYC 20-6778-90 Headlight Assembly - Left
Part #: 20-6778-90

TYC 20-6778-90 Headlight Assembly - Left

TYC Regular, Left
⚙️ 18 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
📦TYC Regular, Left
🚗Fitment: Buick, Lucerne
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Overview of TYC Regular Left Headlight Assembly for Buick Lucerne

The TYC Regular left headlight assembly (part number 20-6778-90) is designed specifically for Buick Lucerne models. This complete headlight assembly includes halogen bulbs and features clear and amber lenses for optimal exterior lighting performance.

  • Complete headlight assembly with bulbs included
  • Halogen bulb types for low beam, high beam, and daytime running lights
  • Clear and amber plastic lens for durability and visibility
  • Plastic housing material for lightweight and corrosion resistance
  • Designed for the left side of Buick Lucerne vehicles

Detailed Product Features and Specifications

This TYC Regular headlight assembly (20-6778-90) is engineered with a plastic lens and housing to provide a balance of durability and weight savings. The assembly includes halogen bulbs for low beam, high beam, and daytime running lights, ensuring consistent lighting performance. The clear and amber lens colors meet exterior lighting requirements, enhancing both visibility and signaling functions. This part is a complete assembly, ready to install on the left side of Buick Lucerne models, providing a direct replacement for the original equipment.

TYC Regular Product Line Information

The TYC Regular product line offers reliable, factory-quality replacement parts designed to meet or exceed OEM standards. This line focuses on providing complete assemblies with included bulbs, making it a practical choice for Buick Lucerne owners seeking a straightforward replacement without additional purchases. The 20-6778-90 headlight assembly is part of this line, ensuring compatibility and consistent performance.

Common Applications and Problem Resolution

  • Replacement for damaged or cracked left headlight lens or housing
  • Restores proper low beam and high beam lighting functionality
  • Fixes issues with non-functioning daytime running lights
  • Improves exterior lighting visibility and signaling compliance
  • Addresses moisture or fogging problems inside the headlight assembly

Installation Notes and Tips

Installation of the TYC Regular left headlight assembly (20-6778-90) is designed to be a direct fit for Buick Lucerne vehicles. Ensure the vehicle is turned off and the battery is disconnected before beginning installation. Carefully remove the old assembly, disconnecting all wiring harnesses, and replace it with the new complete assembly. Verify all halogen bulbs are securely seated and test all lighting functions before finalizing installation.

Quality Assurance and Warranty

TYC Regular parts are manufactured to meet industry standards for fit, form, and function. The 20-6778-90 headlight assembly undergoes quality checks to ensure durability and performance. While specific warranty details are not provided here, TYC typically offers limited warranties on their replacement lighting products. Consult the product packaging or manufacturer resources for exact warranty information.

BrandTYC
Part Number20-6778-90
PositionTYC Regular, Left
Bulbs IncludedYes
Lens ColorClear, amber
Bulb TypeHalogen
Lens MaterialPlastic
Housing MaterialPlastic
Components IncludedComplete assembly
Daytime Running Light Bulb TypeHalogen
High Beam Bulb IncludedYes
High Beam Bulb TypeHalogen
Low Beam Bulb IncludedYes
Low Beam Bulb TypeHalogen
Other Side20-6777-90
PositionLeft

This part fits 18 vehicles. Search below:

YearMakeModelSubmodelBody TypePositionNotes
2011BuickLucerneSuperSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2011BuickLucerneCXLSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2011BuickLucerneCXSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2010BuickLucerneCXSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2010BuickLucerneCXL Special EditionSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2010BuickLucerneSuperSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2010BuickLucerneCXLSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2009BuickLucerneCXSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2009BuickLucerneCXLSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2009BuickLucerneSuperSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2008BuickLucerneSuperSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2008BuickLucerneCXSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2008BuickLucerneCXSSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2008BuickLucerneCXLSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2007BuickLucerneCXLSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2007BuickLucerneCXSSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2006BuickLucerneCXSSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular
2006BuickLucerneCXLSedanLeftComponents Included: Complete Assembly; Other Side: 20-6777-90; TYC Regular

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

This part directly replaces or is cross-referenced with the following part numbers:

25974773

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