Nissan Altra EV Back Up Light Bulb Size

The Nissan Altra EV back up light requires a 921 bulb size for the rear illumination system. Data for the specific bulb requirements covers the period from 1999 to 2001.

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
1999-2001	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 921 bulb is the sole back up light bulb size listed for the Nissan Altra EV across the 1999-2001 model years.
The 921 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American industry standard applicable in both the United States and Canada.
It belongs to the T15 wedge bulb family, a designation that refers to its tubular glass envelope and its base style, which uses a wedge-shaped plastic base rather than a metal screw or bayonet fitting.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
Its rated wattage is 16W, placing it in a moderate output range typical of reverse lighting applications.
The wedge base design of the 921 means it is inserted directly into a socket without rotation, relying on tension from the socket contacts to maintain the electrical connection.
Because the 921 is an ANSI-standardized type, it is produced by multiple manufacturers, and units from different brands are generally interchangeable provided they carry the same 921 designation and match the 12V, 16W rating.