Mercedes-Benz SL600 License Plate Bulb Size

The Mercedes-Benz SL600 license plate light uses a DE3423 bulb size for the exterior lighting system. Available data for the specified vehicle covers the range from 1994 to 2009.

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
2004-2009	DE3423
1994-2002	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 SL600 uses the DE3423 bulb for the license plate position across all listed model years, spanning 1994-2009.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in form and makes electrical contact through metal caps at each end rather than through a base socket or pins.
Festoon bulbs are held in place by spring-loaded clips within the housing, with the end caps pressing against the contacts to complete the circuit.
The DE3423 has a specified length of 41mm, which is a standard festoon size also commonly referenced as the 41mm or C10W category in European markets.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.
The DE3423 designation follows ANSI standards applicable in the United States and Canada, meaning the specification reflects North American market fitment requirements.
Because the DE3423 is an ANSI-coded bulb, it may be cross-referenced with European festoon equivalents only when the physical length and contact type are confirmed to match, as coding systems differ between markets.
The uninterrupted use of the same bulb size across the 1994-2009 model range indicates that the license plate lamp housing design remained consistent throughout those years, making the DE3423 a stable fitment for the SL600.