Ford Transit Connect Back Up Light Bulb Size

The Ford Transit Connect back up light utilizes 921 and 7440 bulb sizes for the rear illumination components. Data for the specified vehicle covers the range from 2010 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
2014-2023	921
2010-2013	7440

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 Ford Transit Connect uses two distinct back up light bulb sizes across its model years, with the 921 bulb fitted to 2014-2023 models and the 7440 bulb fitted to 2010-2013 models.
The 921 is an ANSI-standard wedge bulb in the T15 form factor, rated at 12 volts and 16 watts.
The 7440 is an ANSI-standard single-filament wedge bulb in the T20 form factor, rated at 12 volts and 21 watts.
Both bulb types conform to ANSI standards recognized in the United States and Canada.
The T15 and T20 designations refer to the tubular bulb body size, with T20 being physically larger than T15, making the two types non-interchangeable by form factor alone.
The 7440 draws 21 watts compared to the 921's 16 watts, reflecting a difference in power consumption between the two generations of Transit Connect fitment.
The wedge base design used by both bulb types means the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
The single-filament construction of the 7440 confirms it serves a dedicated switching function, consistent with a reverse light application that operates only when reverse gear is engaged.
Because the 921 and 7440 differ in both body size and wattage, a bulb sourced for a 2010-2013 Transit Connect is not a direct physical fit for a 2014-2023 model, and vice versa.
Both bulb sizes are governed by ANSI standardization, meaning compliant replacements from different manufacturers share the same electrical and physical specifications within each respective type.