Peterbilt 325 Headlight Bulb Size

Additional Notes

• The Peterbilt 325 from 2011-2015 uses the 9007 bulb for both high beam and low beam headlights. The 9007 is a dual-filament halogen bulb with a PX29t base, rated at 12V with 65W on high beam and 55W on low beam, conforming to ANSI standards for the US and Canada.
• The 9004 bulb, used on 2008-2009 models equipped with halogen capsule headlamps, is also a dual-filament halogen type operating at 12V. Its wattage is 65W/45W, making it lower in low-beam output than the 9007. It uses a P29t base, which is distinct from the PX29t base of the 9007, and the two are not interchangeable despite their similar appearance.
• On 2008-2009 models with 2 rectangular headlamps, the H6054 sealed beam unit is specified for both high and low beam positions. As a sealed beam, the entire unit is replaced rather than an internal bulb, and it conforms to the 5x7-inch ANSI rectangular format at 12V.
• The 4x6-inch sealed beam format appears across multiple designations on 2008-2009 models equipped with 4 rectangular headlamps. The H4651 is specified for high beam, while the H4656 (2009) and H4652 (2008) are specified for low beam. All are ANSI-standard 12V sealed beam units where the entire assembly is the replaceable component.
• The H4652 is noted as a variant of the H4651, yet the two serve different beam functions and are not listed as interchangeable. The H4651 covers high beam and the H4652 covers low beam on 2008 models with 4 rectangular headlamps.
• The 2008-2009 model years each present three distinct headlamp configurations, meaning the correct bulb or sealed beam unit depends entirely on which headlamp system is installed on a given vehicle.