The Dodge Ram 2500 Van uses 3457 and 3157 bulb sizes for front turn signals and 3157 size for rear turn signals. The replacement chart covers 1999 through 2003 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge Ram 2500 Van uses two bulb types across its front and rear turn signal positions: the 3457 and the 3157. Both conform to ANSI standards recognized in the United States and Canada.
Both the 3457 and 3157 are dual-filament T25 wedge bulbs rated at 12V with a 27W/7W power draw. The higher wattage filament serves the primary lighting function, while the lower wattage filament serves a secondary role, typically for parking or running light duty.
The T25 designation refers to the bulb's wedge base form factor, which is a common automotive base type that seats directly into a socket without a separate metal base or bayonet pins.
Despite sharing identical voltage, wattage, filament count, and base type, the 3457 and 3157 are not the same part number and are not confirmed as interchangeable within these specifications.
The rear turn signal position on the Dodge Ram 2500 Van uses the 3157 consistently across all listed model years from 1999-2003.
The front turn signal position uses the 3457 for the 1999-2001 and 2003 model years, while the 2002 model year requires the 3157 instead.
The 2002 Dodge Ram 2500 Van is the only model year in which the front and rear turn signal positions share the same bulb size, the 3157.
For all other listed model years (1999-2001 and 2003), the front and rear turn signal positions require different bulb sizes, making position-specific installation relevant during replacement.