The Dodge Ram 1500 Van uses 3457 and 3157 bulb sizes for front turn signals and 3157 for rear turn signals. The replacement chart covers 1999 to 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 1500 Van uses two bulb types across its front and rear turn signal positions for the 1999-2003 model years: the 3457 and the 3157.
Both the 3457 and 3157 are ANSI-standardized bulbs recognized in the United States and Canada, meaning they conform to a defined set of electrical and physical standards shared across those markets.
Each bulb is a dual-filament type, which allows a single bulb to serve two lighting functions, typically a brighter filament for the turn signal and a dimmer filament for a secondary function such as parking or running light duty.
Both bulbs operate at 12 volts with a wattage rating of 27W on the high filament and 7W on the low filament, making their electrical draw identical to one another.
Both bulbs share the T25 wedge form factor, which refers to a wedge-base construction roughly 25mm in width, allowing them to seat without a separate metal base or socket pins.
The rear turn signal position on the Dodge Ram 1500 Van uses the 3157 consistently across all 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 uses the 3157 instead.
Despite the 3457 and 3157 sharing identical voltage, wattage, and T25 wedge construction, they are not confirmed as interchangeable within these specifications, and the distinction between front positions across model years reflects that fitment is year-specific.