Dodge D400 Back Up Light Bulb Size

The Dodge D400 back up light requires either a 1156 or 199 bulb size. The replacement chart covers vehicle production spanning 1978 to 1981.

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
1979-1981	1156
1978	199

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	199

The Dodge D400 back up light specifications cover the 1978-1981 model years, with two distinct bulb sizes listed across that range.
The 1156 bulb is specified for the 1979-1981 Dodge D400, making it the more frequently referenced bulb type across these specifications.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, which is a single-contact base with a 15mm collar.
The 1978 Dodge D400 uses the 199 bulb, which shares the same BA15s bayonet base, 12V operating voltage, and 21W power rating as the 1156.
The 199 is classified as a variant of the 1156, meaning the two bulbs are closely related in design and electrical characteristics.
Despite their similarities, the 199 and 1156 are listed as separate part numbers under the ANSI standard, and their interchangeability is not confirmed by these specifications.
Both the 1156 and 199 carry ANSI designations valid in the US and Canada, indicating standardized performance and dimensional criteria for both types.
The single-filament construction of both bulbs means each serves a single lighting function, which is consistent with the dedicated role of a back up light.