Dodge B300 Back Up Light Bulb Size

The Dodge B300 back up light utilizes 1156, P21W, and 199 bulb sizes depending on the specific version required for the vehicle. Available data for the bulb sizes 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
1976-1980	1156
1972-1975	199

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 Dodge B300 back up light specifications cover model years 1972 through 1980, with two distinct bulb types used across that span.
Model years 1976-1980 of the Dodge B300 use the 1156 bulb for the back up light position.
Model years 1972-1975 use the 199 bulb in the same position.
Both the 1156 and 199 are ANSI-standardized bulbs recognized in the United States and Canada.
Each bulb type is a single-filament design, meaning it serves one lighting function rather than combining two functions within a single housing.
Both bulbs operate at 12 volts and draw 21 watts, placing them in the same electrical load category.
Both types share the BA15s bayonet base, a single-contact base style where the "s" denotes a single contact at the base tip.
The 199 is classified as a variant of the 1156, indicating a close relationship in construction and electrical characteristics between the two bulb types.
Because the 199 is a variant of the 1156 and both share identical voltage, wattage, and base type, the practical distinction between them is narrow, though fitment should still follow the year-specific specification.