Dodge 400 Back Up Light Bulb Size

The Dodge 400 back up light requires a 1156 bulb size for the rear lighting system. Data for the specified bulb covers the range from 1982 to 1983.

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
1982-1983	1156

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

The 1156 is the sole bulb type listed for the Dodge 400 back up light across both available model years, 1982-1983.
The 1156 operates on a 12-volt electrical system and draws 21 watts, placing it in the mid-range of standard automotive incandescent output.
The 1156 follows the ANSI standard recognized in both the United States and Canada, meaning it conforms to a defined set of dimensional and performance criteria shared across those markets.
The bulb uses a BA15s bayonet base, which is a single-contact bayonet mount. The "s" designation indicates a single contact pin, distinguishing it from the dual-contact BA15d base used in some other automotive bulbs.
Because the 1156 is single-filament, it serves a dedicated switching function. In a back up light application, the filament activates only when reverse gear is engaged, with no secondary brightness level.
The BA15s base of the 1156 is not interchangeable with visually similar bulbs that use a BA15d base, as the pin configurations differ and a dual-contact bulb will not seat correctly in a single-contact socket.