Ram 1500 Classic Turn Signal Bulb Size

Additional Notes

• The Ram 1500 Classic uses three distinct turn signal bulb types across its front and rear positions: the 3157NA, the 7440, and the 3057, all of which conform to ANSI standards recognized in both the United States and Canada.
• The 3157NA is a dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high filament and a 7W low filament. Its natural amber glass produces a yellow-tinted output directly from the bulb itself, without relying on a colored lens or housing.
• The 3057 shares the same T25 form factor and 12V, 27W/7W dual-filament configuration as the 3157NA, but it lacks the natural amber glass coating, making the two bulbs electrically similar yet optically distinct.
• The 7440 is a single-filament wedge bulb in the smaller T20 form factor, rated at 12V and 21W. Because it carries only one filament, it is not interchangeable with dual-filament T25 bulbs such as the 3157NA or 3057.
• The Ram 1500 Classic front turn signal position uses the 3157NA for the 2019-2023 model years, though the 2019 fitment applies specifically to vehicles without projector-type headlamps.
• The rear turn signal position shifts between two different bulb types depending on the model year. The 2023 model uses the single-filament 7440, while the 2019 model uses the dual-filament 3057, again limited to vehicles without projector-type headlamps.
• The T20 and T25 designations refer to wedge base sizes that are physically incompatible with one another, meaning the 7440 cannot be seated in a socket designed for the 3157NA or 3057 without modification.
• The projector-type headlamp condition noted for the 2019 model year affects both the front and rear turn signal bulb fitment, indicating that vehicles equipped with that headlamp configuration follow a separate specification not reflected in these entries.