Dodge B3500 Back Up Light Bulb Size

The Dodge B3500 back up light requires a 921 bulb size for proper installation and function within the rear lighting assembly. Data for the specific bulb requirements covers the period from 1995 through 1998.

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
1995-1998	921

Bulb Specifications

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

Other Locations

Additional Notes

The Dodge B3500 uses the 921 bulb size for the back up light across the 1995-1998 model years.
The 921 is a wedge-type bulb, classified under the T15 designation, which refers to its tubular glass envelope size measured in eighths of an inch.
The 921 bulb operates at 12 volts and draws 16 watts, which is typical for incandescent reverse lighting applications.
The 921 follows the ANSI standard, meaning it conforms to specifications recognized in both the United States and Canada.
The wedge base design of the 921 means it is held in its socket by the tension of the base itself rather than by a separate bayonet or screw mechanism, making it a direct friction-fit installation.
The T15 wedge format of the 921 is not universally interchangeable with other wedge bulb sizes such as the T10 or T20, as socket fitment depends on the physical width of the wedge base.