Dodge Ram 2500 Map Light Bulb Size

The Dodge Ram 2500 map light utilizes bulb sizes 212-2 and 192 depending on the specific version of the vehicle. Data for the lighting components covers the range from 1995 through 2010.

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
2009-2010	212-2
2008	192
2007	212-2
2004-2006	192
1995-2003	212-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3W.	192

Other Locations

Additional Notes

The Dodge Ram 2500 map light uses two distinct bulb types across its model years: the 212-2 and the 192, both of which conform to ANSI standards recognized in the United States and Canada.
The 212-2 is a festoon-style bulb with an SV8.5 base and a 41mm length, operating at 12 volts and drawing 12 watts.
The 192 is a T10 miniature wedge bulb, operating at 12 volts and drawing 3 watts, making it significantly lower in wattage than the 212-2.
The 212-2 festoon bulb is the more widely used of the two types in the Dodge Ram 2500, fitting model years 1995-2003, 2007, and 2009-2010.
The 192 wedge bulb fits the 2004-2006 and 2008 model years.
The two bulb types are not interchangeable. The 212-2 uses a festoon base held in place by spring clips at each end, while the 192 uses a wedge base inserted directly into a socket, representing fundamentally different mounting systems.
The wattage difference between the two bulbs is substantial. The 212-2 draws 12 watts while the 192 draws only 3 watts, meaning the two types also differ in the electrical load placed on the map light circuit.
The SV8.5 designation on the 212-2 refers to its base type, where "SV" indicates a single-contact festoon configuration and "8.5" refers to the base width in millimeters.
The T10 designation on the 192 refers to the bulb's tubular shape, with the number indicating a width of 10 eighths of an inch, a standard sizing convention used in miniature automotive bulbs.
A model year change in bulb type occurs between 2003 and 2004, where the Dodge Ram 2500 map light specification shifts from the 212-2 to the 192, and again between 2008 and 2009, where it returns to the 212-2.