Mercedes-Benz 380SL License Plate Bulb Size

The Mercedes-Benz 380SL uses a DE3423 bulb for the license plate light location to provide illumination for the rear vehicle identification area. Data for the specific component covers the period from 1981 through 1985.

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
1981-1985	DE3423

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The Mercedes-Benz 380SL uses the DE3423 bulb for the license plate position across the 1981-1985 model years.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in shape and seats between two spring-loaded end caps rather than fitting into a socket with a base pin or bayonet mount.
The DE3423 carries an ANSI designation, indicating it conforms to a standardized specification recognized in both the United States and Canada.
The bulb operates at 12 volts, which is consistent with the standard electrical system voltage found in passenger vehicles of this era.
The DE3423 has a length of 41mm, a physical specification that is relevant to fitment within the license plate lamp housing, as festoon bulbs must match the span between the two contact points of the holder.
Because the DE3423 is an ANSI-standardized festoon bulb, other festoon bulbs of differing lengths are not interchangeable, even if they share the same voltage rating, as an incorrect length will result in poor contact or failure to seat properly.