GMC K2500 Suburban Headlight Bulb Size

The GMC K2500 Suburban headlight bulb sizes include H6054, 9005, and H4651 for high beam applications, with H6054, 9006, and H4652 options for low beam configurations across different model generations. The replacement chart covers 1979 through 1999 production years with corresponding bulb size specifications for each interval.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

Years	Bulb Size
1992-1999	9005 (With Halogen Capsule Headlamps)
1992-1999	H6054 (With Sealed Beam Headlamps)
1982-1986	H6054 (With 2 Headlamps)
1982-1986	H4651 (With 4 Headlamps)
1981	H6054
1979-1980	H6024

Low Beam Headlight

Years	Bulb Size
1992-1999	9006 (With Halogen Capsule Headlamps)
1992-1999	H6054 (With Sealed Beam Headlamps)
1985-1986	H6054 (With 2 Headlamps)
1985-1986	H4652 (With 4 Headlamps)
1983-1984	H6054 (With 2 Headlamps)
1983-1984	H4656 (With 4 Headlamps)
1982	H6054 (With 2 Headlamps)
1982	H4652 (With 4 Headlamps)
1981	H6054
1979-1980	H6024

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament halogen bulb with P20d base. 12V, 65W.	9005
ANSI standard (US & Canada). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6054
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651
ANSI standard (US & Canada). 7-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6024
ANSI standard (US & Canada). Single-filament halogen bulb with P22d base. 12V, 55W.	9006
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit, variant of H4651. Not a replaceable bulb — the entire unit is replaced. 12V.	H4652
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656

Other Locations

Additional Notes

The H6054 is the most widely specified bulb across the GMC K2500 Suburban headlight data, appearing in both high beam and low beam positions from 1981 through 1999. It is a 5x7-inch rectangular sealed beam unit operating at 12V under the ANSI standard for the US and Canada. As a sealed beam design, the entire unit is replaced rather than an internal filament or capsule.
The 1992-1999 model years with halogen capsule headlamps use the 9005 for high beam and the 9006 for low beam. Both are single-filament halogen bulbs operating at 12V, though they differ in wattage: the 9005 draws 65W while the 9006 draws 55W. They also carry different base types, with the 9005 using a P20d base and the 9006 using a P22d base, making the two bulbs physically non-interchangeable despite their similar appearance.
For the 1992-1999 model years, the GMC K2500 Suburban headlight system is configuration-dependent. Vehicles equipped with sealed beam headlamps use the H6054 for both high and low beam functions, while those equipped with halogen capsule headlamps use separate bulbs for each function.
The 1982-1986 model years with a four-headlamp configuration use H4651-series sealed beam units. The high beam position across those years uses the H4651, while the low beam position varies: the H4652 is specified for 1982 and 1985-1986, and the H4656 is specified for 1983-1984. All three are 4x6-inch rectangular sealed beam units operating at 12V, with H4652 described as a variant of H4651.
The 1979-1980 model years are specified with the H6024, a 7-inch round sealed beam unit operating at 12V under the ANSI standard. Like all sealed beam types in these specifications, the H6024 is replaced as a complete unit.
All sealed beam types listed across the specifications, including the H6054, H6024, H4651, H4652, and H4656, conform to ANSI standards applicable in both the US and Canada. None of them contain a separately replaceable internal bulb.
The 1981 model year is specified with the H6054 for both high and low beam positions without any configuration qualifier, indicating a single headlamp system type for that year.
The low beam H4656, specified for the four-headlamp configuration in 1983-1984, is not listed in the high beam data for those same years, where the H4651 is used instead. This distinction reflects the functional separation between high and low beam sealed beam units in a four-lamp system.