Mercedes-Benz SL320 License Plate Bulb Size

The Mercedes-Benz SL320 license plate light requires a single DE3423 bulb size for proper installation and function. Data for the specified lighting component covers the range from 1994 to 1997.

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
1994-1997	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 SL320 uses the DE3423 bulb for the license plate position across the 1994-1997 model years.
The DE3423 is a festoon-type bulb, which means it is cylindrical in form and makes electrical contact through metal caps at both ends rather than through a base socket.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.
The DE3423 has a 41mm length, which is a critical fitment factor, as festoon bulbs must match the span of the holder to make proper contact at both end caps.
The DE3423 carries an ANSI designation, meaning it conforms to a standardized specification recognized in both the United States and Canada, which allows for consistent cross-brand substitution within that standard.