Ram C/V front and rear turn signal bulbs utilize 3757NA and 3157, 3757NA sizes respectively. Replacement chart data spans 2012 to 2015 model years with bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ram C/V uses two bulb types across its turn signal positions: the 3757NA and the 3157, both of which conform to ANSI standards recognized in the United States and Canada.
Both the 3757NA and the 3157 are dual-filament wedge bulbs built to the T25 form factor, operating on a 12-volt electrical system.
A dual-filament design means a single bulb serves two brightness levels, typically allowing one filament to function as a running or parking light while the other handles the higher-intensity turn signal flash.
The 3757NA carries natural amber glass, which produces an amber-colored output without relying on a tinted lens or colored housing to achieve the required signal color.
The 3157 does not incorporate colored glass, meaning its amber output depends on the vehicle's lens rather than the bulb itself.
The Ram C/V (2012-2015) uses the 3757NA for the front turn signal across all four model years covered in the specifications.
The rear turn signal position on the Ram C/V shifted from the 3757NA in 2012 to the 3157 in 2013-2014, indicating the two bulb types are not interchangeable for that position across all model years.
Although the 3757NA and 3157 share the same T25 wedge base and 12-volt rating, substituting one for the other in the rear turn signal position would not reflect the correct factory specification for every model year.
The 3157 is rated at 27W on its high-intensity filament and 7W on its low-intensity filament, a wattage split common to dual-filament automotive signal bulbs.