The Dodge 400 high beam headlight uses an H4651 bulb size while low beam headlights require either H4656 or H4652 bulb sizes for proper illumination. The replacement chart covers 1982 to 1983 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge 400 uses sealed beam headlight units across its 1982-1983 model years, meaning the entire lens-reflector-filament assembly is replaced as one unit rather than swapping an internal bulb.
All three headlight types found in these specifications, the H4651, H4656, and H4652, conform to ANSI standards recognized in both the United States and Canada, and all operate on a 12V electrical system.
Each of these sealed beam units follows the 4x6-inch rectangular form factor, a standardized housing shape that was common in American vehicle lighting of that era.
The H4651 serves as the high beam unit for both the 1982 and 1983 Dodge 400, making it the only headlight type shared identically across both model years and both positions in the lineup.
The low beam position shows a fitment difference between model years: the 1983 Dodge 400 uses the H4656, while the 1982 model uses the H4652, indicating these two part numbers are not interchangeable between years despite sharing the same physical form factor.
The H4652 is described as a variant of the H4651, meaning the two share a common design basis, though they are designated for different lighting functions and should not be substituted for one another without confirming the correct application.