Maserati Quattroporte Back Up Light Bulb Size

The Maserati Quattroporte back up light uses P21W and 1156 bulb sizes for the rear illumination system. Data for the specified lighting components covers the period from 1984 through 2012.

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
2009-2012	1156
1984-1986	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 Maserati Quattroporte uses the 1156 bulb across all listed model years for the back up light position.
The listed model years span two separate periods: 1984-1986 and 2009-2012, with the 1156 specification applying to both.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical characteristics conform to a defined industry standard recognized in the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is consistent with standard automotive incandescent back up light applications.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, distinguishing it from double-contact bayonet variants.
The single-filament design of the 1156 means the bulb serves one lighting function only, which is appropriate for a dedicated back up light rather than a combined stop/tail application.
The BA15s bayonet base is not interchangeable with the BA15d base, which carries two offset pins. Substituting a double-contact bulb in a single-contact socket is not compatible.
The 1156 is sometimes listed alongside the 7506 designation in aftermarket catalogs, as both share the same base and wattage under different numbering conventions.