Sterling 825 Back Up Light Bulb Size

The Sterling 825 back up light requires bulb size 1156 or P21W depending on the specific application. Data for the provided bulb sizes covers the range from 1987 to 1988.

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
1987-1988	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 specified for the Sterling 825 backup light across both listed model years, 1987-1988.
The 1156 operates on 12 volts with a 21-watt single filament, making it a standard incandescent bulb suited for on/off lighting functions such as backup lights, which require no variable brightness.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin offset to one side, which prevents incorrect insertion orientation.
The 1156 carries ANSI standardization recognized in both the United States and Canada, meaning the bulb conforms to a defined set of electrical and physical tolerances shared across those markets.
Because the 1156 is a single-filament bulb, it is not interchangeable with the visually similar 1157, which carries a dual filament and a BA15d double-contact bayonet base despite sharing a comparable physical profile.