The Dodge B100 headlight bulb utilizes H6024 and H4651 sizes for high beam operation and H6024 and H4656 sizes for low beam operation, with each bulb size corresponding to specific lighting functions. The replacement chart covers 1971 through 1980 model years and details bulb size specifications across the vehicle production range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6024 is a 7-inch round sealed beam unit operating at 12V under the ANSI standard applicable in the US and Canada. As a sealed beam, the entire unit is replaced rather than an internal filament or bulb element. It serves as both the high beam and low beam headlight across the Dodge B100 from 1971-1978, and also on 1979-1980 two-headlamp configurations.
The H4651 and H4656 are both 4x6-inch rectangular sealed beam units rated at 12V under the same ANSI standard. Like the H6024, neither accepts a replaceable internal bulb; the whole unit is exchanged upon failure.
On the Dodge B100, the H4651 handles the high beam function while the H4656 handles the low beam function. Although both share the same physical 4x6-inch rectangular sealed beam format and voltage rating, they are not interchangeable between beam positions.
The four-headlamp system, present on 1979-1980 models, divides high and low beam duties between two distinct sealed beam types, whereas the two-headlamp system uses a single H6024 unit that covers both functions within one assembly.
The H6024 is the dominant bulb type across the B100 specification range, appearing in every listed model year from 1971-1980 in at least one headlamp configuration.