Ram 1500 Brake Bulb Size

Additional Notes

• The Ram 1500 brake lights use three distinct bulb types across the 2011-2024 model years: the 7440, 921, 3157, and 3057, all of which conform to ANSI standards recognized in both the United States and Canada.
• The 3057 and 3157 are both dual-filament T25 wedge bulbs rated at 12V with a 27W/7W output. The dual-filament design allows a single bulb to serve two functions, typically combining a lower-intensity running light with a higher-intensity brake signal.
• Although the 3057 and 3157 share the same T25 form factor and wattage ratings, they are listed as separate fitments across different model years of the Ram 1500, and substituting one for the other without confirming compatibility is not advised.
• The 3057 bulb is specified for the Ram 1500 brake light from 2013-2018, but only on vehicles without projector-type headlamps, indicating that headlamp configuration determines brake bulb fitment for those years.
• The 7440 is a single-filament T20 wedge bulb rated at 12V and 21W. Unlike the dual-filament 3057 and 3157, it carries only one circuit, which limits its use to applications requiring a single lighting function.
• For the 2020 Ram 1500, the 7440 is specified only on vehicles with halogen capsule headlamps, while the 2019 model year uses the 3157 under the same halogen capsule headlamp condition, reflecting a change in brake bulb specification between those two years for that trim configuration.
• The 921 is a single-filament T15 wedge bulb rated at 12V and 16W. It is the specified bulb for the center high mount stop light across all listed model years of the Ram 1500, from 2011-2024, without any noted configuration exceptions.
• The 921 also appears as the brake bulb for the 2023 Ram 1500, making it the only bulb type in these specifications to serve both the standard brake light position and the center high mount stop light position.