Ram 1500 Tail Light Bulb Size

Additional Notes

• The 7440 bulb is a single-filament T20 wedge type rated at 12V and 21W, making it the only single-filament bulb across these tail light specifications. All other bulb types listed are dual-filament designs, meaning they serve two lighting functions from a single housing.
• The 7443 shares the same T20 wedge base as the 7440 but adds a second filament, giving it a 21W/5W dual-filament rating at 12V. Despite the physical similarity in base type, the two bulbs are not interchangeable due to the difference in filament count.
• The 3057 and 3157 are both dual-filament T25 wedge bulbs rated at 12V and 27W/7W. Their wattage ratings are identical, yet they are listed as distinct part numbers and are not considered interchangeable in automotive fitment applications.
• The Ram 1500 (2024) is the only model year in these specifications to use the 7443 bulb, while the 2021-2023 model years share the 7440. The shift from 7440 to 7443 between 2023 and 2024 reflects a change from single-filament to dual-filament in the T20 form factor.
• The 2020 and 2019 model years each carry a conditional fitment note tied to headlamp type. The 2020 year specifies the 7440 only for vehicles with Halogen Capsule Headlamps, while 2019 specifies the 3157 under the same condition.
• The 3057 bulb applies to the Ram 1500 across the 2013-2018 model years, each entry conditioned on the absence of Projector-Type Headlamps. This indicates that vehicles from those years equipped with Projector-Type Headlamps require a different bulb not listed in these specifications.
• The 2011-2012 model years use the 3157 without any conditional fitment notes, distinguishing them from later years where headlamp configuration determines the correct bulb selection.
• All four bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, and all operate on a 12V electrical system consistent with standard automotive applications.