Ram 3500 Parking Light Bulb Size

Additional Notes

• The parking light bulb specifications for the Ram 3500 span the 2011-2024 model years, covering three distinct bulb types across that range: the 3157, 3157NA, and 7443/7444NA families.
• The 3157NA is the most frequently specified bulb across these years, appearing in Ram 3500 applications from 2013-2018 without projector-type headlamps, as well as in the four-headlamp configurations of the 2011 and 2012 models.
• The 3157 and 3157NA bulbs share identical electrical ratings of 12V, 27W/7W and use the same T25 wedge base, but the NA designation indicates a natural amber glass envelope rather than a clear one, which produces an amber output without a separate colored lens.
• The 7443 and 7444NA bulbs used in the 2019-2024 Ram 3500 are T20 wedge types rated at 12V, 21W/5W, making them electrically and physically distinct from the T25-based 3157 series used in earlier model years.
• All four bulb types listed are dual-filament designs, meaning each bulb serves two lighting functions, typically combining a brighter filament for turn signal use with a dimmer filament for the parking light function.
• The 2011 and 2012 Ram 3500 models require different bulbs depending on headlamp count: the two-headlamp configuration uses the clear 3157, while the four-headlamp configuration uses the amber-tinted 3157NA.
• For the 2019-2020 Ram 3500 (With Halogen Capsule Headlamps), the specified bulb is the 7444NA, which carries the natural amber glass construction of the NA designation within the smaller T20 wedge form factor.
• The 3157 and 3157NA are not interchangeable with the 7443 and 7444NA despite sharing dual-filament designs, as the T25 and T20 wedge bases differ in size and the wattage ratings between the two families are not the same.