The Ram 1500 side marker utilizes 12961 and 7443 bulb sizes for the lighting components. Data for 2021 through 2024 provides specific details regarding the bulbs used for the exterior lighting.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ram 1500 front side marker position uses two distinct bulb types across its model years: the 12961 miniature wedge and the 3157/3157NA dual-filament wedge, with fitment determined by headlamp configuration.
The 12961 is a Philips part number for a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. It serves as the front side marker on the Ram 1500 for the 2019-2021 and 2023 model years under specific headlamp conditions.
The 3157NA is an ANSI-standard dual-filament T25 wedge bulb with natural amber glass, rated at 12V with a 27W high filament and 7W low filament. The amber tint is built into the glass rather than applied as a coating, which affects color output without the use of a colored lens.
The 3157 and 3157NA share the same ANSI T25 wedge form factor and identical 12V/27W/7W electrical ratings. The sole distinction between them is the natural amber glass of the 3157NA, making the two physically interchangeable in socket terms but not equivalent in light color output.
For the Ram 1500 (2011-2012), the front side marker fitment splits between the 3157 and 3157NA based on whether the truck has a two-headlamp or four-headlamp arrangement, with the 3157NA assigned to the four-headlamp configuration.
From 2013-2018, the Ram 1500 front side marker standardized on the 3157NA exclusively for trucks without projector-type headlamps, indicating that projector-equipped trims used a different lighting arrangement not covered by this bulb position.
The 2019-2020 model years carry a conditional note for the front side marker, specifying the 12961 for trucks with halogen capsule headlamps. This marks the transition point where the front side marker moved from the larger T25 3157NA to the smaller T10 12961 format.
The rear side marker on the Ram 1500 uses the 3057 across the 2013-2019 model years, restricted to trucks without projector-type headlamps. The 3057 is an ANSI-standard dual-filament T25 wedge rated at 12V/27W/7W, sharing its physical base type with the 3157 and 3157NA.
Although the 3057 and 3157 series share the same T25 wedge base and voltage rating, they are not interchangeable without verification, as their filament wattage configurations differ and substitution can affect circuit compatibility and light output.
The 12961 operates at 5W, substantially lower than the 27W high-filament rating of the T25 wedge bulbs used elsewhere in the same marker position on earlier model years, reflecting a shift toward lower-wattage lighting in the front side marker assembly.