Ram 2500 Tail Light Bulb Size

Additional Notes

• The Ram 2500 tail light specifications cover model years 2011-2024, with four distinct bulb types used across that span: 1157, 7440, 3157, and 3057.
• The 3057 is the most frequently specified bulb across these entries, appearing in six consecutive model years (2013-2018) under the condition of non-projector-type headlamp configurations. It is a dual-filament T25 wedge bulb rated at 12V with a 27W high-filament and 7W low-filament output.
• The 3157 shares the same T25 wedge form factor and identical 12V, 27W/7W electrical ratings as the 3057, yet the two are not universally interchangeable. Subtle differences in filament orientation between the 3057 and 3157 can affect socket fitment and function in applications where polarity or pin alignment is critical.
• The 2019-2020 Ram 2500 entries specify the 3157 bulb exclusively for vehicles equipped with halogen capsule headlamps, indicating that headlamp configuration directly determines the correct tail light bulb for those years.
• The 2023 Ram 2500 uses the 7440, which differs from all other bulbs in these specifications by having a single filament rather than dual filaments. Operating at 12V and 21W, it is a T20 wedge type and is not a drop-in replacement for any dual-filament socket.
• The 2024 Ram 2500 uses the 1157, which is the only bulb in these specifications with a BAY15d bayonet base rather than a wedge base. Its bayonet mount is physically incompatible with the wedge sockets used by the 7440, 3157, and 3057 bulbs.
• The 1157 operates at 12V with a 21W high filament and 5W low filament, making it a dual-filament bayonet bulb. Its lower wattage ratings distinguish it electrically from the dual-filament wedge types specified for earlier model years.
• Because the Ram 2500 tail light bulb type varies by model year and, in some years, by headlamp configuration, substituting a bulb from a different model year without accounting for base type and filament count risks improper fitment or function.