The Sterling 827 brake light uses 1156 and P21W bulb sizes for the lighting systems on the vehicle. Data for the specific components 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.
The 1156 is the sole bulb type listed across all brake light positions for the Sterling 827, covering model years 1989-1991.
The 1156 is an ANSI-standardized bulb recognized in both the United States and Canada, which places it within a widely adopted North American specification framework.
As a single-filament bulb, the 1156 is designed to perform one lighting function at a time, making it suited to dedicated brake light circuits rather than combined stop/tail applications.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d base used in some other automotive bulbs.
The 1156 operates at 12 volts and 21 watts, consistent with standard 12V automotive electrical systems.
Both the brake light and the Center High Mount Stop Light positions on the Sterling 827 share the same 1156 specification across all three listed model years, indicating a uniform fitment across these two distinct lamp positions.
The BA15s base is not interchangeable with the BA15d base; substituting a dual-contact bulb in a single-contact socket would result in improper fitment or electrical incompatibility.