The Peterbilt 340 high beam and low beam headlight bulbs utilize H6054, 9004, and H4651 or H4652 sizes depending on configuration. The replacement chart covers 2007 through 2009 production specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Peterbilt 340 (2007-2009) accommodates three distinct headlamp configurations: two rectangular headlamps, four rectangular headlamps, and halogen capsule headlamps. Each configuration requires a different bulb type for both high and low beam functions.
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, meaning a single bulb type covers both functions in that setup.
The 9004 is a dual-filament halogen bulb rated at 12V with a 65W high beam filament and a 45W low beam filament, fitted with a P29t base. A single 9004 bulb handles both high and low beam output in the halogen capsule headlamp configuration.
The H4651, H4652, and H4656 are all 4x6-inch rectangular sealed beam units operating at 12V under the ANSI standard. In the four-rectangular-headlamp configuration, the high beam position uses the H4651 across 2007-2009, while the low beam position uses the H4652 in 2008-2009 and the H4656 in 2007.
The H6054, H4651, H4652, and H4656 are sealed beam units, meaning the reflector, lens, and filament form a single non-serviceable assembly. Replacement requires substituting the entire unit rather than an internal bulb component.
The H4651 and H4652 are variants of the same 4x6-inch sealed beam form factor. Despite their physical similarity, they are not interchangeable, as each is specified for a distinct beam position within the four-rectangular-headlamp configuration.
All bulb types listed across the three headlamp configurations conform to ANSI standards applicable in both the United States and Canada, and all operate on a 12V electrical system.