Peterbilt 385 Headlight Bulb Size

Additional Notes

• The Peterbilt 385 high beam and low beam headlight specifications across 1995-2008 draw from three distinct headlamp system types: 2-rectangular, 4-rectangular, and halogen capsule configurations, with round headlamp systems also present in 1995-1997 model years.
• The 9004 bulb is the only individually replaceable bulb type in the Peterbilt 385 specifications. It is a dual-filament halogen unit rated at 65W for high beam and 45W for low beam, operating at 12V with a P29t base, and it serves both beam functions within a single halogen capsule headlamp assembly.
• All sealed beam types listed, including the H6054, H4651, H4652, H4656, H5001, and H5006, are complete self-contained units. When one of these units fails, the entire assembly is replaced rather than an internal bulb.
• The H6054 is a 5x7-inch rectangular sealed beam unit that functions as both the high beam and low beam source in the 2-rectangular headlamp configuration, remaining consistent across all 1995-2008 model years of the Peterbilt 385.
• In the 4-rectangular headlamp configuration, the high beam position uses the H4651 across 1995-2008, while the low beam position alternates between the H4652 and H4656 depending on the model year, making these two variants non-interchangeable despite sharing the same 4x6-inch rectangular sealed beam format.
• The H5001 and H5006 are round sealed beam units exclusive to the 1995-1997 model years. The H5001 covers the high beam position and the H5006 covers the low beam position within the 4-round headlamp configuration.
• All bulb and sealed beam types listed across the specifications conform to ANSI standards recognized in both the United States and Canada, and all operate on a 12V electrical system.
• The 4-round headlamp configuration, which uses the H5001 and H5006 sealed beam units, does not appear in model years 1998-2008, as those years list only the 2-rectangular, 4-rectangular, and halogen capsule configurations.