Peterbilt 310 Headlight Bulb Size

Additional Notes

• The Peterbilt 310 (1986-1987) accommodates four distinct headlamp configurations: 2-rectangular, 4-rectangular, 4-round, and halogen capsule systems. Each configuration requires its own specific bulb type, and these types are not interchangeable across configurations.
• The H6054 is a 5x7-inch rectangular sealed beam unit operating at 12V and conforming to ANSI standards for the US and Canada. It serves both high and low beam functions within the 2-rectangular headlamp configuration, meaning a single bulb type covers both beam roles in that setup.
• The 9004 is the only non-sealed-beam type listed in these specifications. It is a dual-filament halogen bulb with a P29t base, rated at 12V with 65W for high beam and 45W for low beam. Its dual-filament design allows one physical bulb to handle both beam functions in the halogen capsule headlamp configuration.
• Sealed beam units, including the H6054, H4651, H4652, H5001, and H5006, are not serviceable at the bulb level. When a sealed beam fails, the entire unit requires replacement rather than an internal bulb swap.
• The 4-rectangular headlamp configuration uses two distinct sealed beam types depending on beam function: the H4651 for high beam and the H4652 for low beam. Both are 4x6-inch rectangular units, with the H4652 classified as a variant of the H4651.
• The 4-round headlamp configuration similarly splits beam functions across two separate sealed beam units: the H5001, a 4-inch square sealed beam, handles high beam, while the H5006, a 5.75-inch round sealed beam, handles low beam.
• All bulb and sealed beam types listed for the Peterbilt 310 operate at 12V and conform to ANSI standards applicable in both the United States and Canada.
• The specifications for the 1986 and 1987 model years are identical across all four headlamp configurations and both beam functions, with no variation in bulb types between those two years.