Dodge D300 Back Up Light Bulb Size

The Dodge D300 back up light utilizes bulb size 1156, 199, or P21W depending on the specific configuration of the lighting assembly. Data for the lighting components covers the range from 1975 through 1980.

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
1979-1980	1156
1978	199
1975-1977	1156

Bulb Specifications

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

Other Locations

Additional Notes

The 1156 is the most frequently specified back up light bulb for the Dodge D300, appearing across five of the six model years listed: 1975-1977 and 1979-1980.
The 1156 is an ANSI-standard single-filament bulb rated at 12 volts and 21 watts, fitted with a BA15s bayonet base.
The BA15s bayonet base designation indicates a single-contact base with a 15mm collar, which locks into the socket with a push-and-twist motion.
The 1978 Dodge D300 uses the 199 bulb rather than the 1156 for the back up light position.
The 199 is classified as a variant of the 1156, sharing the same ANSI-standard single-filament construction, BA15s bayonet base, 12-volt rating, and 21-watt output.
Because the 199 and 1156 share the same base type and electrical ratings, their physical and electrical characteristics are closely related, though they carry distinct ANSI part numbers.
Both bulb types meet ANSI standards applicable in the United States and Canada.
Single-filament construction in both bulb types means each serves only one lighting function, which is consistent with the dedicated role of a back up light circuit.