Chrysler Conquest Back Up Light Bulb Size

The Chrysler Conquest back up light requires bulb size 1156 or P21W depending on the specific version of the vehicle. Data for the lighting components covers the range from 1987 to 1989.

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
1987-1989	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 back up light position across the 1987-1989 Chrysler Conquest.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than sharing a housing with a dual-purpose circuit.
It operates on a 12-volt system and draws 21 watts, which is standard for incandescent reverse lighting applications of that era.
The 1156 uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d base used on some visually similar bulbs.
The 1156 carries ANSI standardization recognized in both the United States and Canada, placing it within a regulated specification for base dimensions and electrical ratings.
The BA15s single-contact base is not interchangeable with the BA15d dual-contact base, and substituting one for the other is not possible without a socket modification.