Dodge Ram 2500 Van Dome Light Bulb Size

The Dodge Ram 2500 Van dome light requires bulb sizes 579, 211-2, or 578 depending on the specific application. Data for 1999 through 2003 provides the necessary information for the interior lighting components.

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
2002-2003	579
2001	211-2
1999-2000	578

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	579
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578

Other Locations

Additional Notes

The dome light bulb specifications for the Dodge Ram 2500 Van span model years 1999-2003, with three distinct bulb sizes used across that period: 578, 211-2, and 579.
All three bulb types listed are ANSI-standardized festoon bulbs rated at 12V and 12W, meaning they share identical electrical characteristics despite their physical differences.
Festoon bulbs are cylindrical lamps that mount horizontally between two contact points, a common format for interior dome lighting in passenger and commercial vehicles.
The 579 bulb, used in the 2002-2003 model years, measures 44mm in length and uses end-cap contacts, making it the longest of the three types listed.
The 578 bulb, fitted to the 1999-2000 model years, measures 41mm in length and also uses end-cap contacts, making it physically shorter than the 579 despite sharing the same contact style.
The 211-2 bulb, used exclusively in the 2001 model year, measures 41mm in length but uses an SV8.5 base rather than end-cap contacts, distinguishing it from the 578 despite identical length and wattage.
Because the 578 and 211-2 share the same length and electrical ratings but differ in base type, they are not interchangeable, and substituting one for the other in the Dodge Ram 2500 Van would result in an improper fit.
The 579 and 578 differ in length by 3mm and share the same end-cap contact style, but the length difference means they are not direct substitutes for one another across model years.
The shift across three consecutive bulb sizes over a five-year span indicates that the dome light housing specification changed at least twice during the 1999-2003 production run of the Ram 2500 Van.
When sourcing a replacement, the model year is the primary factor in determining the correct bulb, as no single bulb type covers the full 1999-2003 range.