The Ram 3500 side marker utilizes a 194 bulb size for illumination purposes within the lighting assembly. Data for the specified component covers the range from 2017 through 2024.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ram 3500 front side marker position uses two distinct bulb families across its model years: the T10 miniature wedge form factor and the larger T25 dual-filament wedge form factor. These two families are physically incompatible with one another due to differing base sizes and socket types.
The 3157NA is the most frequently specified front side marker bulb across the Ram 3500 lineup, covering the 2013-2018 model years when the vehicle is equipped without projector-type headlamps. Its natural amber glass envelope produces the amber color required for side marker functions without relying on a colored lens.
The 3157 and 3157NA share identical electrical ratings at 12V with a 27W high-filament and 7W low-filament draw, and both use the T25 wedge base. The key distinction is that the 3157NA incorporates a natural amber glass coating, while the 3157 uses clear glass. Substituting a clear 3157 where a 3157NA is specified may affect the emitted color if the housing lens is also clear.
The 2012-2011 Ram 3500 front side marker fitment depends on headlamp count. Two-headlamp configurations use the clear 3157, while four-headlamp configurations use the amber 3157NA, indicating that the lens or housing color differs between those two headlamp arrangements.
For the 2019-2020 model years, the front side marker transitions to the 2825 bulb, a T10 miniature wedge rated at 12V and 5W, used specifically on vehicles with halogen capsule headlamps. This represents a significant reduction in wattage compared to the T25 dual-filament bulbs used in earlier years.
The 194 is the most widely appearing rear side marker bulb across the Ram 3500 specifications. It is a T10 miniature wedge rated at 12V and 3.78W, making it the lowest-wattage bulb in this specification set.
The 2825 and 194 bulbs both occupy the T10 wedge form factor and share the W2.1x9.5d base type. However, their wattage ratings differ, with the 2825 drawing 5W and the 194 drawing 3.78W, so they are not confirmed interchangeable within these specifications.
The 3057 rear side marker bulb appears on the Ram 3500 for the 2013-2018 model years under the condition of no projector-type headlamps. Like the 3157 and 3157NA, it is a T25 dual-filament wedge at 12V, 27W/7W, though it is a distinct ANSI type and is not a direct substitute for the 3157 series without confirming socket compatibility.
The 2017-2018 rear side marker position lists both the 3057 and the 194 as separate entries, each tied to different trim or equipment configurations. This indicates that two physically different socket types exist at the rear side marker location depending on how the vehicle is configured.
The 2019-2020 rear side marker specifies the 194 only for vehicles with dual rear wheels, reflecting a configuration-specific fitment rather than a universal application across all Ram 3500 variants of those years.