Prevost Marathon Headlight Bulb Size

The Prevost Marathon high beam headlight uses H4656 or H4651 bulb sizes, while the low beam headlight requires an H4656 bulb size. The replacement chart covers vehicle production years spanning 1984 to 1986 with corresponding bulb specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

YearsBulb Size
1984-1986H4651
H4656

Low Beam Headlight

YearsBulb Size
1984-1986H4656

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.H4651
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.H4656

Other Locations

Additional Notes