The Dodge Power Ram 50 headlight bulb size specifications include H4651 for high beam and H4652 or H4656 for low beam applications, with each bulb size corresponding to distinct lighting functions. The replacement chart covers vehicle production years spanning 1983 to 1986, detailing bulb size requirements across this model generation.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge Power Ram 50 uses sealed beam headlight units across its 1983-1986 model years, with all specified bulb types falling under ANSI standards recognized in both the United States and Canada.
The H4651, H4652, and H4656 are all 4x6-inch rectangular sealed beam units operating at 12 volts. None of these units contain a replaceable bulb element; the entire sealed assembly is the serviceable component.
The H4651 sealed beam unit serves as the high beam headlight for the Dodge Power Ram 50 across all four model years covered, from 1983 through 1986, with no variation in that position.
The low beam headlight position shows a fitment difference for the 1985 model year, which uses the H4656 rather than the H4652 specified for the 1983, 1984, and 1986 model years.
The H4652 is described as a variant of the H4651, sharing the same 4x6-inch rectangular sealed beam format and 12-volt rating. Despite their physical similarities, the two units are designated for separate lighting positions and are not interchangeable without confirming the correct application.
The H4656 shares the same physical format and voltage rating as the H4651 and H4652 but carries a distinct ANSI designation, indicating a difference in beam pattern or light output characteristics suited to its specific application.
Because all three unit types share the same 4x6-inch rectangular sealed beam housing, substitution errors are a recognized risk during replacement. The ANSI designation on each unit is the reliable indicator of the correct specification for a given position and model year.