American Motors AMX high beam and low beam headlight bulbs utilize H4651, H6024, and H4652 bulb sizes depending on configuration. The replacement chart covers vehicle production years spanning 1968 to 1980 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 H6024 is a 7-inch round sealed beam unit operating at 12V and conforming to ANSI standards for the US and Canadian markets. As a sealed beam design, the entire unit is replaced rather than an internal filament or bulb element.
The H4651 and H4652 are both 4x6-inch rectangular sealed beam units operating at 12V under the same ANSI standard framework. The H4652 is a variant of the H4651, with the two types serving distinct functions rather than being interchangeable with each other.
On the American Motors AMX, the H4651 is designated for the high beam position and the H4652 for the low beam position for the 1979-1980 model years. Because these are separate variants, substituting one for the other would not satisfy the correct beam function.
The 1968-1978 AMX uses the H6024 for both the high beam and low beam positions. A single sealed beam type serving both functions is characteristic of a two-headlight system, where each unit contains dual filaments for both beam modes.
The transition from the round H6024 to the rectangular H4651 and H4652 units occurred between the 1978 and 1979 model years on the AMX. Round and rectangular sealed beam units are not physically interchangeable due to differences in housing shape and mounting configuration.
All three bulb types covered in these specifications, the H6024, H4651, and H4652, are sealed beam units. In a sealed beam design, the reflector, lens, and filament are fused into a single glass assembly, meaning any filament failure requires full unit replacement.