Ford L9000 Back Up Light Bulb Size

The Ford L9000 back up light utilizes a single 1156 bulb size for the lighting component. Available information covers the period starting in 1981 and ending in 1997.

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
1981-1997	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 L9000 uses the 1156 bulb size for its back up lights across all specified model years, from 1981 to 1997.
The 1156 is an ANSI-standardized bulb type recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical standards shared across manufacturers.
This bulb operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent automotive reverse lighting applications.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, as opposed to dual-filament types that handle two functions such as braking and running lights simultaneously.
The BA15s bayonet base on the 1156 features a single locating pin on the side of the base, which distinguishes it from the BA15d base that carries two offset pins. Substituting a BA15d bulb in a BA15s socket is not a compatible swap.
The "s" in BA15s stands for single contact, referring to the single pin alignment of the bayonet fitting, which also means the bulb has no polarity orientation requirement during installation.
Because the 1156 is an ANSI-standardized type, aftermarket and OEM-equivalent replacements from various manufacturers are generally interchangeable as long as they carry the same 1156 designation and BA15s base.