The Mercedes-Benz 560SEC uses 9004 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production spanning 1986 to 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz 560SEC uses the 9004 bulb for both high beam and low beam headlights across the full 1986-1991 production run.
The 9004 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments to serve both high and low beam functions within one housing.
Because the 9004 handles both beam functions simultaneously, the high beam and low beam positions on the 560SEC are not served by separate bulb types.
The 9004 operates on a 12-volt electrical system and draws 65 watts on the high beam filament and 45 watts on the low beam filament.
The 9004 uses a P29t base, which is a specific bayonet-style connector that physically determines which bulb types are compatible with the socket.
The 9004 conforms to ANSI standards applicable in the United States and Canada, classifying it as a regulated bulb type within those markets.
The 9004 is sometimes confused with the 9007 bulb, which shares a similar appearance but has reversed filament positions, making the two types non-interchangeable despite their physical resemblance.