Dodge B100 Back Up Light Bulb Size

The Dodge B100 back up light uses bulb size 1156, 199, or P21W depending on the specific version of the component. Data for the bulb sizes covers the range from 1975 to 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
1978-1980	1156
1976-1977	199
1972-1975	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 bulb is the most frequently specified back up light bulb for the Dodge B100, appearing across the 1972-1975 and 1978-1980 model years.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The BA15s bayonet base uses a single contact pin, which is the defining feature of the single-filament design used in back up light applications.
The 199 bulb is specified for the 1976-1977 Dodge B100 back up lights.
The 199 is classified as a variant of the 1156, sharing the same ANSI-standard BA15s bayonet base, 12V rating, and 21W output.
Because the 1156 and 199 share the same base type and electrical ratings, their physical and electrical construction is closely related, though they carry distinct ANSI part numbers.
Both bulb types conform to ANSI standards recognized in the United States and Canada.
A single-filament design, as found in both the 1156 and 199, means the bulb serves one lighting function only, which is consistent with dedicated back up light use.