Peterbilt 340 Headlight Bulb Size

Additional Notes

• 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.