Sterling 827 Back Up Light Bulb Size

The Sterling 827 back up light requires bulb size 1156 or P21W depending on the specific production requirements for the vehicle. Data for the bulb size covers the range from 1989 to 1991.

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
1989-1991	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 1156 is the sole bulb type listed for the Sterling 827 backup light across the 1989-1991 model years.
The 1156 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical parameters shared across manufacturers.
It operates on a 12-volt circuit and draws 21 watts, which is typical of incandescent automotive backup 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 light within a single housing.
The BA15s bayonet base uses a single locating pin on the base collar, and this single-pin configuration is not interchangeable with the BA15d base, which carries two offset pins and is found on dual-filament variants such as the 1157.