GMC K1500 Suburban Headlight Bulb Size

The GMC K1500 Suburban headlight bulb specifications include high beam sizes of H6054, 9005, and H4651, along with low beam sizes of H6054, 9006, and H4656 for this model. The replacement chart covers vehicle production years spanning 1979 to 1999 with corresponding bulb size data.

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)
1986	H6054 (With 2 Headlamps)
1986	H4656 (With 4 Headlamps)
1985	H6054 (With 2 Headlamps)
1985	H4652 (With 4 Headlamps)
1984	H6054 (With 2 Headlamps)
1984	H4656 (With 4 Headlamps)
1983	H6054 (With 2 Headlamps)
1983	H4652 (With 4 Headlamps)
1982	H6054 (With 2 Headlamps)
1982	H4656 (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. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit, variant of H4651. Not a replaceable bulb — the entire unit is replaced. 12V.	H4652

Other Locations

Additional Notes

The GMC K1500 Suburban's headlight specifications span the 1979-1999 model years, covering three distinct sealed beam formats alongside halogen capsule options introduced in the 1992-1999 range.
The H6054 is the most frequently specified bulb across these specifications, 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, in which the entire lens-and-reflector assembly is replaced as one piece rather than a separate inner bulb.
The 1979-1980 model years used the H6024, a 7-inch round sealed beam unit at 12V. Like all sealed beam types in these specifications, the full unit is replaced rather than an individual bulb.
For the 1982-1986 four-headlamp configuration, the high beam position used the H4651, a 4x6-inch rectangular sealed beam unit at 12V. The low beam position in that same configuration alternated between the H4656 and H4652 depending on the year, both of which share the same 4x6-inch rectangular sealed beam format at 12V.
The 9005 and 9006 are single-filament halogen capsule bulbs used in the 1992-1999 model years when the vehicle was equipped with halogen capsule headlamps rather than sealed beams. Unlike sealed beam units, these bulbs are replaceable without disturbing the headlamp housing.
The 9005 handles the high beam function and draws 65W at 12V through a P20d base, while the 9006 handles the low beam function at 55W through a P22d base. The two bulbs use different base types and are not interchangeable with each other despite their similar appearance.
Vehicles from 1992-1999 required confirmation of headlamp type before bulb selection, as sealed beam units (H6054) and halogen capsule bulbs (9005 or 9006) were both valid fitments for those years and are not cross-compatible.
All bulb types listed across these specifications conform to ANSI standards applicable in both the United States and Canada, indicating standardized physical and electrical characteristics across manufacturers for each designated size.