Dodge Magnum Back Up Light Bulb Size

The Dodge Magnum back up light utilizes bulb size 921, P21W, or 1156 depending on the specific version of the component required for the vehicle. Data for the listed components covers the range from 1978 through 2008.

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
2005-2008	921
1978-1979	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Dodge Magnum back up light specifications cover two distinct model generations, each using a different bulb type.
The 921 bulb is a T15 wedge-base type, rated at 12V and 16W, and meets the ANSI standard for the US and Canada. It is used across the 2005-2008 Dodge Magnum.
The wedge base of the 921 bulb means it is held in its socket by friction rather than a locking mechanism, requiring no rotation during installation or removal.
The 1156 bulb features a BA15s single-contact bayonet base, rated at 12V and 21W, and also meets the ANSI standard for the US and Canada. It is used in the 1978-1979 Dodge Magnum.
The BA15s designation on the 1156 bulb indicates a single-contact bayonet fitting with a 15mm base width, which locks into its socket with a twist.
The 1156 bulb draws 21W compared to the 921 bulb's 16W, reflecting a difference in power consumption between the two generations of the Dodge Magnum.
The 921 and 1156 bulbs are not interchangeable. Their base types are physically incompatible, as one uses a wedge fitting and the other a bayonet fitting.
Both bulb types operate on a 12V electrical system, which is standard for passenger vehicles of their respective eras.