The Mercedes-Benz 600SEL uses 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1992 to 1993 model 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 9003 bulb is an ANSI-standardized halogen type used in the United States and Canada. It carries a dual-filament design, meaning a single bulb contains separate filaments for high beam and low beam operation, rated at 60W and 55W respectively.
The 9003 operates on a 12-volt electrical system, which is standard for passenger vehicle applications of its era.
The P43t base is the mounting interface of the 9003 bulb. This base type follows a specific keyed design that ensures correct orientation during installation, as misalignment of a halogen filament relative to the reflector housing affects light output pattern.
The Mercedes-Benz 600SEL uses the 9003 bulb across both the high beam and low beam headlight positions for the 1992-1993 model years, with no variation between those positions or those years.
Because the 9003 serves both beam functions in the 600SEL, the vehicle does not use separate single-filament bulbs for each headlight function. This is a design characteristic tied to the reflector or projector housing, which directs light from each filament into the appropriate beam pattern.
The 9003 shares its physical and electrical characteristics with the H4 bulb, a globally common halogen type. However, the 9003 designation is specific to the ANSI standard applicable in the United States and Canada, and substitution between these types warrants verification of base compatibility before use.