Peterbilt 349 Headlight Bulb Size

The Peterbilt 349 headlight bulb size specifications include H6054, 9004, and H4651 for high beam applications, along with H6054, 9004, and H4652 for low beam applications. The replacement chart covers 1986 to 1987 vehicle production years 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
1986-1987	H6054 (With 2 Rectangular Headlamps)
	H4651 (With 4 Rectangular Headlamps)
	H5001 (With 4 Round Headlamps)
	9004 (With Halogen Capsule Headlamps)

Low Beam Headlight

Years	Bulb Size
1986-1987	H6054 (With 2 Rectangular Headlamps)
	H4652 (With 4 Rectangular Headlamps)
	H5006 (With 4 Round Headlamps)
	9004 (With Halogen Capsule 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). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651
ANSI standard (US & Canada). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5001
ANSI standard (US & Canada). Dual-filament halogen bulb with P29t base. 12V, 65W/45W.	9004
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). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5006

Other Locations

Additional Notes

The Peterbilt 349 (1986-1987) accommodates four distinct headlamp configurations: two-rectangular, four-rectangular, four-round, and halogen capsule. Each configuration requires its own specific bulb types, and substituting across configurations is not supported by these specifications.
The H6054 is a 5x7-inch rectangular sealed beam unit operating at 12V and conforming to ANSI standards for the US and Canada. It serves both high and low beam functions within the two-rectangular headlamp configuration, meaning a single bulb type covers both beam modes in that setup.
The 9004 is a dual-filament halogen bulb with a P29t base, rated at 12V with 65W for high beam and 45W for low beam. Its dual-filament design allows one bulb to handle both beam functions, which distinguishes it from the sealed beam units used in the other configurations.
Sealed beam units such as the H6054, H4651, H4652, H5001, and H5006 are not serviceable at the bulb level. When a sealed beam unit fails, the entire unit requires replacement rather than an internal component.
The four-rectangular headlamp configuration uses two different sealed beam types depending on beam function: the H4651 for high beam and the H4652 for low beam. Both are 4x6-inch rectangular units, with the H4652 classified as a variant of the H4651.
The four-round headlamp configuration similarly splits beam functions across two sealed beam types: the H5001, a 4-inch square sealed beam unit, handles high beam, while the H5006, a 5.75-inch round sealed beam unit, handles low beam.
All bulb and sealed beam types listed across both model years operate at 12V and conform to ANSI standards applicable in the US and Canada, indicating a standardized electrical and regulatory baseline across the entire headlamp system.
The specifications for the 1986 and 1987 Peterbilt 349 are identical across all four headlamp configurations for both high and low beam positions, with no variation in bulb types between the two years.