The Dodge Ram 3500 Van brake light uses 3157 and 2458 bulb sizes depending on the specific application for the vehicle. Available data for the lighting components covers the period from 1999 through 2003.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge Ram 3500 Van uses the 3157 bulb for the brake lights across the 1999-2003 model years. This bulb follows the ANSI standard applicable in both the US and Canada.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a 27W/7W output. The dual-filament design allows a single bulb to serve both the brake light function and a lower-intensity running light function.
The Center High Mount Stop Light on the 1999-2003 Ram 3500 Van does not use a single bulb size across all years. Three different bulb sizes appear in that position depending on the model year.
The 921 bulb is specified for the Center High Mount Stop Light on the 1999-2000 Ram 3500 Van. It is a T15 wedge bulb rated at 12V and 16W, conforming to ANSI standards for the US and Canada.
The 2001 Ram 3500 Van uses the 922 bulb in the Center High Mount Stop Light position. Like the 921, it is a T15 wedge bulb rated at 12V and 16W under the same ANSI standard.
The 922 and 921 share identical voltage and wattage ratings at 12V and 16W, and both are T15 wedge bulbs under ANSI standards. Despite these similarities, they are distinct part numbers and are not confirmed as interchangeable within these specifications.
The 2002-2003 Ram 3500 Van uses the 912 bulb in the Center High Mount Stop Light position. The 912 is a T15 wedge bulb rated at 12V and 12W, and is described as a variant of the 921.
Although the 912 is noted as a variant of the 921, the two bulbs differ in wattage. The 912 is rated at 12W while the 921 is rated at 16W, which represents a meaningful difference in light output and electrical draw.
All four bulb types listed in these specifications, the 3157, 912, 922, and 921, conform to ANSI standards recognized in both the US and Canada.
The T25 designation of the 3157 indicates a larger wedge base than the T15 designation shared by the 912, 922, and 921. These two base sizes are physically incompatible with each other's sockets.