Dodge Ram 3500 Van Map Light Bulb Size

The Dodge Ram 3500 Van map light requires bulb size 579 or 906 depending on the specific version of the vehicle. Data for the lighting components covers the range from 1999 to 2003.

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
2003	579
1999-2002	906

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	579
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906

Other Locations

Additional Notes

The Dodge Ram 3500 Van uses two distinct bulb types across its map light specifications: the 579 festoon bulb and the 906 miniature wedge bulb.
The 579 is a festoon-style bulb measuring 44mm in length with end-cap contacts, rated at 12V and 12W under the ANSI standard applicable in the US and Canada.
The 906 is a T10 miniature wedge bulb rated at 12V and 8W, also conforming to the ANSI standard for the US and Canada. Its wedge base differs structurally from the end-cap contact design of the 579.
The Dodge Ram 3500 Van (2003) uses the 579 bulb for the map light, while the 1999-2002 model years use the 906 bulb.
The 579 and 906 bulbs are not interchangeable. Their base types are physically incompatible, as the 579 uses end-cap contacts while the 906 uses a wedge-style base.
The wattage difference between the two bulbs is notable: the 579 draws 12W compared to the 8W rating of the 906, meaning the 2003 model year map light operates at a higher power draw than those of the preceding four years.