Mercedes-Benz 200 Map Light Bulb Size

The Mercedes-Benz 200 map light requires a bulb size of 12821 for the interior lighting system. Data for the specified component covers the range from 1966 to 1968.

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
1966-1968	12821

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12821

Other Locations

Additional Notes

The Mercedes-Benz 200 uses the 12821 bulb across its 1966-1968 model years for the map light position.
The 12821 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base.
The T10 designation refers to a tubular bulb approximately 10mm wide, commonly found in low-current interior lighting applications such as map and courtesy lights.
The W2.1x9.5d base is a wedge-type connector, meaning the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
The 12821 operates at 12 volts and consumes 5 watts, which is typical for small interior cabin lighting in vehicles of this era.
Because the W2.1x9.5d base is a standardized wedge format, physical fitment into the socket does not by itself confirm electrical compatibility, as voltage and wattage ratings must also correspond to the vehicle's circuit requirements.