Ram 1500 Map Light Bulb Size

The Ram 1500 map light utilizes bulb sizes 12961, 212-2, and 578 depending on the specific version of the vehicle. Available information covers a span of time starting from 2011 through 2024.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Type	Shop
2024	12961	Check Price
2023	212-2	Check Price
2021	212-2	Check Price
2013-2020	578	Check Price
2011-2012	212-2	Check Price

Bulb Specifications

Description	Type	Shop
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961	Check Price
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2	Check Price
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578	Check Price

Other Locations

Additional Notes

The bulb type 578 is the most frequently specified map light bulb across the Ram 1500 model years listed, covering 2013-2020.
The 578 is an ANSI-standard festoon bulb with a 41mm length, end-cap contacts, and a 12V, 12W electrical rating.
The 212-2 is also an ANSI-standard festoon bulb rated at 12V and 12W with a 41mm length, but it uses an SV8.5 base rather than end-cap contacts, making it a distinct fitment from the 578 despite sharing the same voltage, wattage, and body length.
The 212-2 is specified for the Ram 1500 in 2011-2012 and again in 2021 and 2023, while the 578 covers the intervening years, indicating that the two non-interchangeable festoon types alternate across the model's production span.
The 2024 Ram 1500 map light specification shifts entirely to the 12961, a miniature wedge-type bulb (T10) with a W2.1x9.5d base rated at 12V and 5W, which is a lower wattage than either festoon type used in prior years.
Because the 12961 uses a wedge base and the 578 and 212-2 use festoon-style bases, these three bulb types are not interchangeable with one another regardless of shared voltage ratings.
The 12961 designation is a Philips part number rather than an ANSI industry standard, which distinguishes it from the 578 and 212-2 designations used across all other listed years.