The Peterbilt 388 headlight bulb size chart specifies replacement bulb options including 9005, H6054, 9004, and H11 sizes for high and low beam applications. The replacement chart covers vehicle production years spanning 2008 to 2015.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9005 bulb is the high beam headlight fitment for the Peterbilt 388 across the 2011-2015 model years. It is a single-filament halogen bulb rated at 12V and 65W, built to the ANSI standard used in the United States and Canada, and uses a P20d base.
The H11 bulb serves as the low beam headlight fitment for the same 2011-2015 span. Unlike the 9005, it follows the ECE standard common in Europe and worldwide, though it also carries US approval. It operates at 12V and 55W through a PGJ19-2 base, and its lower wattage reflects its role as a sustained low beam rather than a high-intensity high beam.
The 9004 is a dual-filament halogen bulb rated at 12V with a split wattage of 65W for high beam and 45W for low beam. Its P29t base and dual-filament design allow a single bulb to serve both beam functions within one housing, which is the configuration used on 2008-2009 Peterbilt 388 vehicles equipped with halogen capsule headlamps.
The H6054 is a 5x7-inch rectangular sealed beam unit operating at 12V. It is not a replaceable bulb in the conventional sense, as the entire unit is replaced when it fails. This type appears in both the high beam and low beam positions on 2008-2009 vehicles fitted with 2 rectangular headlamps, meaning a single sealed beam handles both functions depending on its position in the housing.
The H4651 and H4652 are 4x6-inch rectangular sealed beam units, also governed by the ANSI standard. Both are complete replacement units rather than individual bulbs. The H4651 covers the high beam position and the H4652 covers the low beam position on 2008-2009 vehicles equipped with 4 rectangular headlamps. Despite their shared physical format, the two types are not interchangeable due to their distinct beam pattern designations.
The 2008-2009 model years of the Peterbilt 388 present three distinct headlamp configurations: 2 rectangular headlamps using H6054 sealed beams, 4 rectangular headlamps using H4651 and H4652 sealed beams, and halogen capsule headlamps using the 9004 bulb. Selecting the correct replacement requires confirming which of these three configurations is present on the specific vehicle.