The Ram 3500 tail light utilizes 7443, 3157, 3057, and 2458 bulb sizes depending on the specific version required for the rear lighting assembly. Available data covers the range from 2011 through 2023 for the various configurations listed.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 3057 bulb is the most frequently specified size across the lower tail light positions in these specifications, covering the Ram 3500 from 2013-2018, though its application is restricted to trims without projector-type headlamps.
Both the 3057 and 3157 are dual-filament T25 wedge bulbs rated at 12V, 27W/7W under the ANSI standard, meaning they share the same wattage and base type, yet they are not universally interchangeable due to differing filament configurations that affect how the high and low intensities are activated.
The 7443 is a dual-filament T20 wedge bulb rated at 12V, 21W/5W, while the 7440 is a single-filament T20 wedge bulb rated at 12V, 21W. Although both share the T20 wedge form factor, the 7440 cannot substitute for the 7443 in positions requiring dual-filament operation, such as combined stop and tail functions.
The 1157 uses a BAY15d bayonet base rather than a wedge base, which physically distinguishes it from all other bulbs in these specifications and prevents cross-fitment with wedge-socket positions.
The 2023 Ram 3500 lower tail light position lists both the 1157 and the 7443, indicating that two distinct bulb sizes apply to that model year depending on the specific trim or configuration of the vehicle.
The 2019-2020 lower tail light positions specify the 3157 only for trims with halogen capsule headlamps, reflecting a configuration-dependent fitment that requires confirmation of the headlamp type before selecting a replacement bulb.
The upper tail light transitions from the 7443 in 2023 to the 7440 in 2024, representing a shift from a dual-filament to a single-filament bulb in that position between those two model years.
All bulbs listed in these specifications conform to the ANSI standard as used in the United States and Canada, meaning they follow standardized electrical and physical ratings applicable across those markets.