Renault Alliance Back Up Light Bulb Size

The Renault Alliance back up light uses 1156 and P21W bulb sizes for the rear illumination system. Data for the specific lighting components covers the period from 1983 to 1987.

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
1983-1987	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 Renault Alliance uses the 1156 bulb for the back up light across all listed model years, spanning 1983-1987.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are defined by a recognized North American standard used in both the United States and Canada.
This bulb operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent 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 light simultaneously.
The BA15s designation refers to a bayonet-style base with a 15mm collar and a single contact pin, which locks into the socket with a push-and-twist motion.
The "s" in BA15s indicates a single-pin base, which is not interchangeable with the BA15d base, the latter having two offset pins. Substituting one for the other is not possible without a socket mismatch.