Chevrolet Blazer Headlight Bulb Size

Additional Notes

• The D3S is an ECE-standard, mercury-free HID (xenon) discharge bulb rated at 42V and 35W, fitted with a PK32d-5 base and an integral ignitor. It is designed exclusively for projector-type housings. The Chevrolet Blazer uses this bulb for both high and low beam functions in 2019-2020 models equipped with HID headlamps, meaning a single bulb type serves both beam positions in those configurations.
• The 9005 and 9006 are both ANSI-standard single-filament halogen bulbs operating at 12V, but they differ in wattage and base type. The 9005 carries a P20d base and draws 65W for high beam use, while the 9006 uses a P22d base and draws 55W for low beam use. These two bulbs are not interchangeable despite their physical similarity, as the base configurations are distinct.
• The Blazer used the 9005 for high beam and the 9006 for low beam across the 1998-2003 model years, as well as in 1995-1997 models fitted with halogen capsule headlamps rather than sealed beam units.
• Sealed beam units such as the H6054, H4666, H6024, H4701, H4651, H4703, H4656, and H4652 are not replaceable bulbs. When one of these units fails, the entire headlamp assembly is replaced rather than an internal component.
• The H6054 is a 5x7-inch rectangular sealed beam unit used on the Blazer in both two-headlamp and four-headlamp configurations from 1991-1994, covering both high and low beam positions in two-headlamp setups. In four-headlamp setups, dedicated beam-specific sealed beam units were used alongside or instead of it.
• In four-headlamp configurations from 1987-1991, the Blazer used separate sealed beam units for high and low beams. The high beam units were the H4651 (1987-1988) and H4701 (1989-1991), while the low beam units were the H4652 (1987), H4656 (1988), and H4703 (1989-1991). These units are not interchangeable with one another despite sharing the same general sealed beam format.
• The H6024 is a 7-inch round sealed beam unit used on the Blazer from 1969-1974 for both high and low beam positions. Like all sealed beam types in these specifications, it operates at 12V and is replaced as a complete unit.
• The 1995-1997 Blazer models present a dual-fitment situation, where either sealed beam or halogen capsule headlamps were installed depending on the trim or configuration. The sealed beam variants used the H4666 unit, while the halogen capsule variants used the 9005 for high beam and the 9006 for low beam. These two headlamp systems are not cross-compatible.