Mercedes-Benz 450SE Map Light Bulb Size

The Mercedes-Benz 450SE map light requires a bulb size of 3893 for the interior lighting system. Data for the specified component covers the range from 1973 to 1976.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1973-1976	3893

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, specialty application. 12V.	3893

Other Locations

Additional Notes

The Mercedes-Benz 450SE uses the 3893 bulb for the map light across all listed model years, spanning 1973-1976.
The 3893 is an ANSI-standardized bulb, meaning it conforms to a defined North American specification recognized in both the United States and Canada.
The 3893 carries a BAY15d bayonet base, which is an offset twin-pin base. The two pins are positioned at different heights, a design that prevents incorrect insertion by ensuring the bulb can only be seated in one orientation.
As a dual-filament bulb, the 3893 contains two separate filaments within a single envelope, each serving a distinct electrical circuit or function.
The 3893 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this era.
The BAY15d base type is shared across various automotive bulb applications, though fitment compatibility depends on the specific socket design in the vehicle. A bulb sharing the same base type is not automatically interchangeable if its wattage or filament configuration differs from the original specification.