Ram ProMaster Dome Light Bulb Size

The Ram ProMaster dome light bulb uses 6461 and DE3423 sizes for this vehicle model. The replacement chart covers 2014 to 2021 production years with corresponding bulb size data.

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
2021	6461
2014-2018	DE3423

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6461
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The Ram ProMaster dome light uses two festoon bulb types across its model years: the 6461 for 2021 and the DE3423 for 2014-2018.
Both the 6461 and DE3423 are ANSI-standard bulbs recognized in the US and Canada, and both operate on a 12-volt electrical system.
Festoon bulbs are cylindrical lamps that mount horizontally between two spring-loaded contacts or end caps, a form factor common in interior dome and map light applications.
The 6461 bulb has a 36mm length and uses an SV8.5 base, which is a single-contact bayonet-style end fitting centered on the bulb body.
The DE3423 bulb has a 41mm length and uses end-cap contacts, meaning electrical contact is made through metal caps at each end of the bulb rather than through a central base fitting.
The 5mm difference in length between the 6461 (36mm) and the DE3423 (41mm) means the two types are not physically interchangeable, as festoon bulb fitment depends on the socket span matching the bulb length.
The differing base designs of the two bulbs, SV8.5 on the 6461 versus end-cap contacts on the DE3423, represent an additional incompatibility beyond length alone.
The 6461 carries a rated wattage of 5W, while no wattage value is specified for the DE3423 in the provided data.