The Ford L800 high beam and low beam headlight bulbs utilize H6024 and H4651 sizes for high beam applications, along with H6024 and H4656 sizes for low beam configurations. The replacement chart covers 1980 through 1985 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford L800 headlight bulb specifications for 1980-1985 are divided into two headlamp system configurations: a two-round-headlamp system and a four-rectangular-headlamp system, each requiring different bulb types across both high and low beam positions.
The H6024 is a 7-inch round sealed beam unit operating at 12V and conforming to ANSI standards applicable in the US and Canada. It serves as both the high beam and low beam bulb in the two-round-headlamp configuration across all six model years covered.
Because the H6024 is a sealed beam unit, the entire assembly is replaced rather than an internal filament or capsule. This applies equally to its high beam and low beam roles in the two-round-headlamp system.
The four-rectangular-headlamp configuration uses two distinct bulb types: the H4651 for high beam and the H4656 for low beam. Both are 4x6-inch rectangular sealed beam units rated at 12V and built to the same ANSI standard.
Although the H4651 and H4656 share the same physical 4x6-inch rectangular sealed beam format and voltage rating, they are not interchangeable, as each is designated for a specific beam function within the four-lamp system.
The sealed beam construction of the H4651 and H4656 means the entire unit is replaced upon failure, consistent with the design standard of that headlamp format.
The Ford L800 with the two-round-headlamp system uses a single bulb type, H6024, for both beam functions, whereas the four-rectangular-headlamp system requires two separate bulb types, one per beam function.