Ram 1500 Back Up Light Bulb Size

The Ram 1500 back up light utilizes 7440 and 921 bulb sizes for the rear illumination system. Available information covers the specific time range 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 Size
2023-2024	7440
2021	921
2020	7440 (With Halogen Capsule Headlamps)
2013-2019	7440 (With Projector-type Headlamps)
2013-2019	921 (Without Projector-Type Headlamps)
2011-2012	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The two back up light bulb sizes specified for the Ram 1500 across these model years are the 7440 and the 921, both of which conform to ANSI standards recognized in the United States and Canada.
The 7440 is a single-filament wedge bulb in the T20 form factor, rated at 12 volts and 21 watts, making it the higher-wattage of the two types listed.
The 921 is a wedge bulb in the smaller T15 form factor, rated at 12 volts and 16 watts.
Although both bulbs share the same wedge-base design and voltage rating, their wattage and physical form factors differ, meaning they are not interchangeable with one another.
For the Ram 1500, the headlamp configuration determines which back up light bulb is required on 2013-2020 model years, with projector-type headlamps corresponding to the 7440 and non-projector configurations corresponding to the 921.
The 2020 Ram 1500 specifies the 7440 specifically for vehicles equipped with halogen capsule headlamps, reflecting a similar pattern of headlamp-dependent fitment.
The 2023-2024 model years use the 7440 exclusively, with no conditional fitment noted in the specifications.
The 2011-2012 and 2021 model years use the 921 exclusively, also with no conditional fitment noted.