Ford Courier Back Up Light Bulb Size

The Ford Courier back up light utilizes 1156 and P21W bulb sizes for illumination. Data for the specified components covers the range from 1972 through 1982.

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
1972-1982	1156

Bulb Specifications

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

Other Locations

Additional Notes

The Ford Courier uses the 1156 bulb for the back up light across all listed model years, spanning 1972-1982.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than combining two, such as stop and tail, into a single unit.
It operates on a 12-volt electrical system at 21 watts, which is consistent with standard automotive low-voltage architecture of that era.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. This base type requires a twist-and-lock installation rather than a screw-in method.
The 1156 is an ANSI-standardized bulb recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by multiple manufacturers.
Because the 1156 is single-contact, it is not interchangeable with the 1157, which shares the same BA15d bayonet base style but carries a dual-contact, dual-filament design for combined stop and tail functions.