Dodge Conquest Back Up Light Bulb Size

The Dodge Conquest back up light requires bulb size 1156 or P21W depending on the specific version of the component installed in the vehicle. Available data covers the range from 1984 through 1986.

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
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 1156 is the sole bulb type listed for the back up light across all documented model years of the Dodge Conquest, covering 1984-1986.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is typical of single-filament incandescent bulbs used in directional or reverse lighting 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 variant used in other bulb types.
As a single-filament bulb, the 1156 serves functions requiring only one lighting mode, making it well suited to back up lights, which operate independently without a secondary intensity level.
The 1156 conforms to ANSI standards recognized in both the United States and Canada, indicating a standardized specification rather than a proprietary or region-exclusive part.
The BA15s base of the 1156 is not interchangeable with visually similar bulbs that use a BA15d base, as the pin configuration differs and incorrect substitution would prevent proper seating in the socket.