Peterbilt 227 Headlight Bulb Size

The Peterbilt 227 headlight bulb size specifications include H6054, 9004, and H4651 for high beam applications, along with H6054, 9004, and H4656 for low beam configurations. The replacement chart covers 1990 to 1994 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
1990-1994	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
1994	H6054 (With 2 Rectangular Headlamps)
	H4656 (With 4 Rectangular Headlamps)
	H5006 (With 4 Round Headlamps)
	9004 (With Halogen Capsule Headlamps)
1993	H6054 (With 2 Rectangular Headlamps)
	H4652 (With 4 Rectangular Headlamps)
	H5006 (With 4 Round Headlamps)
	9004 (With Halogen Capsule Headlamps)
1990-1992	H6054 (With 2 Rectangular Headlamps)
	H4656 (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. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656
ANSI standard (US & Canada). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5006
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 Peterbilt 227 (1990-1994) was offered with four distinct headlamp configurations: two rectangular headlamps, halogen capsule headlamps, four rectangular headlamps, and four round headlamps. Each configuration requires a different bulb type for both high and low beam positions.
The H6054 is a 5x7-inch rectangular sealed beam unit operating at 12V. It serves as both the high beam and low beam bulb in the two-rectangular-headlamp configuration across all model years covered, meaning a single sealed unit handles both functions in that setup.
The 9004 is the only non-sealed-beam bulb type in these specifications. It is a dual-filament halogen bulb with a P29t base, rated at 12V and 65W for high beam and 45W for low beam, and it is used in the halogen capsule headlamp configuration for both beam positions across all covered years.
All sealed beam units in these specifications, including the H6054, H4651, H4656, H5001, H5006, and H4652, are replaced as complete units rather than having a separate replaceable bulb inside. All operate at 12V and conform to ANSI standards applicable in the US and Canada.
The four-rectangular-headlamp configuration uses different bulb types for high and low beam. The high beam position takes the H4651, while the low beam position takes the H4656, H4652, or H4656 depending on the year. In 1993 specifically, the low beam in that configuration is the H4652, a variant of the H4651, rather than the H4656 used in other years.
The four-round-headlamp configuration uses the H5001 for high beam and the H5006 for low beam across all covered years. The H5001 is a 4-inch square sealed beam unit, while the H5006 is a 5.75-inch round sealed beam unit, making these two physically distinct units despite appearing in the same headlamp system.
Because the H4651, H4652, and H4656 are all 4x6-inch rectangular sealed beam units sharing the same physical format, substituting one for another in the wrong beam position would result in incorrect light output, as each is calibrated for either high or low beam duty.
The 9004 bulb is the sole dual-filament halogen type across these specifications, meaning it consolidates both high and low beam functions into one replaceable capsule, unlike the sealed beam configurations where separate units are used for each beam position.