Dodge Ram 1500 Van Map Light Bulb Size

The Dodge Ram 1500 Van map light requires bulb size 579 or 906 depending on the specific version of the interior lighting component. Data for the bulb size chart covers the range from 1999 through 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 906 bulb is the map light specification for the Dodge Ram 1500 Van across the 1999-2002 model years.
The 906 follows the ANSI standard recognized in both the US and Canada, and belongs to the T10 miniature wedge family, which uses a wedge-shaped base that presses directly into a socket without requiring a separate holder or cap.
The 906 operates at 12 volts and draws 8 watts, placing it in the lower output range typical of interior courtesy and map lighting applications.
The 2003 Dodge Ram 1500 Van uses a 579 bulb for the map light, which differs from the bulb type used in the four preceding model years.
The 579 also conforms to the ANSI standard for the US and Canadian markets, and is a festoon-type bulb measuring 44mm in length with end-cap contacts at each end, which seat into spring-loaded clips within the fixture.
The 579 operates at 12 volts and draws 12 watts, making it a higher-wattage unit than the 906 used in earlier model years.
The wedge base of the 906 and the end-cap festoon design of the 579 represent two mechanically incompatible socket types, meaning the two bulbs are not interchangeable despite both being 12-volt automotive bulbs.
The wattage difference between the 906 at 8 watts and the 579 at 12 watts also means the two bulbs draw different amounts of current, which is a relevant factor beyond physical fitment alone.