GMC V3500 Headlight Bulb Size

The GMC V3500 high beam headlight uses bulb sizes H6054, H4701, or 9005, while the low beam headlight requires H6054, H4703, or 9006 bulb sizes. The replacement chart covers 1987 to 1991 model years with corresponding bulb size specifications for each production year.

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
1988-1991	H6054 (With 2 Rectangular Headlamps)
	H4701 (With 4 Rectangular Headlamps)
	9005 (With Halogen Capsule Headlamps)
1987	H6054 (With 2 Headlamps)
1987	H4651 (With 4 Headlamps)

Low Beam Headlight

Years	Bulb Size
1988-1991	H6054 (With 2 Rectangular Headlamps)
	H4703 (With 4 Rectangular Headlamps)
	9006 (With Halogen Capsule Headlamps)
1987	H6054 (With 2 Headlamps)
1987	H4656 (With 4 Headlamps)

Bulb Specifications

Description	Bulb Size
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). 7-inch round sealed beam unit, variant. Not a replaceable bulb — the entire unit is replaced. 12V.	H4701
ANSI standard (US & Canada). Single-filament halogen bulb with P20d base. 12V, 65W.	9005
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.	H4703
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

Other Locations

Additional Notes

The GMC V3500 (1987-1991) used three distinct headlamp system configurations across its production run: a 2-lamp rectangular setup, a 4-lamp rectangular setup, and a halogen capsule system. Each configuration requires different bulb sizes for both high and low beam functions, and the systems are not interchangeable with one another.
The H6054 is a 5x7-inch rectangular sealed beam unit operating at 12V. It serves as both the high beam and low beam in the 2-rectangular-lamp configuration across the 1988-1991 model years, meaning a single sealed beam type handles both functions in that system.
Sealed beam units such as the H6054, H4701, H4703, H4651, and H4656 are not constructed with replaceable bulbs. When a sealed beam fails, the entire unit requires replacement rather than an internal component.
The 9005 and 9006 are single-filament halogen bulbs used in the halogen capsule headlamp configuration on the 1988-1991 V3500. The 9005 handles high beam duty at 65W with a P20d base, while the 9006 handles low beam duty at 55W with a P22d base. These two bulbs are not interchangeable due to their differing base types and wattage ratings.
The H4701 and H4703 are both 7-inch round sealed beam units used in the 4-rectangular-lamp configuration for the 1988-1991 model years. The H4701 serves the high beam position and the H4703 serves the low beam position. Despite sharing the same physical form factor, they are designated separately and are not interchangeable between positions.
The 1987 model year used a distinct set of bulbs in its 4-lamp configuration. The high beam position used the H4651 and the low beam position used the H4656, both 4x6-inch rectangular sealed beam units. These designations differ from the H4701 and H4703 units used in the same lamp positions for the 1988-1991 years.
All bulb types listed across both headlamp positions and all model years operate at 12V and conform to ANSI standards applicable in the United States and Canada.
The halogen capsule headlamp system, present on the 1988-1991 V3500, is the only configuration in these specifications where the internal bulb is a serviceable, replaceable component rather than a sealed unit.