The Dodge Ram 2500 brake light utilizes unique bulb sizes 1157, 2458, 3057, and 3157 for various lighting applications across the vehicle. Available data covers a span of production from 1994 through 2010 for the specified components.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The brake light positions on the Dodge Ram 2500 draw from three bulb families across the 1994-2010 model range: the dual-filament wedge types 3157 and 3057, the dual-filament bayonet type 1157, and the single-filament wedge types 921 and 912.
The 3157 and 3057 are both ANSI-standard dual-filament T25 wedge bulbs rated at 12V with a 27W high filament and 7W low filament, making them functionally similar in output despite their different part numbers.
The 1157 is an ANSI-standard dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W high filament and 5W low filament, and it is not interchangeable with the T25 wedge types due to its distinct base design.
The 921 and 912 are both ANSI-standard single-filament T15 wedge bulbs rated at 12V, with the 921 drawing 16W and the 912 drawing 12W. The 912 is a lower-wattage variant of the 921 and the two are not identical replacements for one another.
For the 2009 Dodge Ram 2500, the brake bulb specification depends on headlamp configuration: the two-headlamp variant uses a 3157, while the four-headlamp variant uses a 3057.
The same 2009 headlamp-based split applies to the center high mount stop light, where the two-headlamp configuration takes a 912 and the four-headlamp configuration takes a 921.
The 3157 and 3057 share the same T25 wedge base and identical wattage ratings, but they differ in the physical keying of their base, which is designed to prevent cross-installation. Substituting one for the other is generally not recommended without confirming socket compatibility.
The center high mount stop light on the Ram 2500 uses only single-filament bulbs across all listed years, consistent with its function as a dedicated stop signal that does not require a separate running-light filament.
The 1157 with its BAY15d bayonet base was specified for the brake lights on the Ram 2500 during the 1994-1995, 1998, and 2000-2002 model years, representing a physically distinct socket type from the wedge-base bulbs used in other years.
The 912 bulb appears in the center high mount stop light position for the 2003-2008 model years and for the two-headlamp 2009 configuration, while the 921 covers all remaining years in that position, including 1994-2002, 1999, and the four-headlamp 2009 and 2010 entries.