Ram 1500 Classic Back Up Light Bulb Size

The Ram 1500 Classic back up light utilizes 921 and 7440 bulb sizes for the rear illumination system. Data for the specific lighting components covers the range from 2019 to 2023.

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	921
2021	7440
2019	7440 (With Projector-type Headlamps)
2019	921 (Without Projector-Type Headlamps)

Bulb Specifications

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

Other Locations

Additional Notes

The Ram 1500 Classic uses two distinct backup light bulb types across its model years: the 921 and the 7440, both of which meet ANSI standards for the US and Canadian markets.
The 921 is a T15 wedge bulb rated at 12V and 16W. The T15 designation refers to the bulb's tubular shape, with the number indicating its width in eighths of an inch.
The 7440 is a T20 single-filament wedge bulb rated at 12V and 21W. Its higher wattage means it produces more light output than the 921, and the single-filament construction means it serves only one lighting function.
The 2023 Ram 1500 Classic uses the 921 bulb, while the 2021 model uses the 7440. These two years require different bulb sizes despite being the same model, so the two types are not interchangeable between those years.
The 2019 Ram 1500 Classic presents a split fitment based on headlamp configuration. Vehicles equipped with projector-type headlamps take the 7440, while those without projector-type headlamps take the 921.
For 2019 models, confirming the headlamp type before selecting a replacement bulb is necessary, as installing the wrong size could result in an improper fit or non-functional backup light.