Dodge W300 Back Up Light Bulb Size

The Dodge W300 back up light utilizes 1156, 199, and P21W bulb sizes depending on the specific version of the vehicle. 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
1978-1980	1156
1977	199
1976	1156
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 W300 back up light specifications span model years 1975-1980, with two bulb types appearing across this range: the 1156 and the 199.
The 1156 is the more frequently specified bulb, covering the 1976 and 1978-1980 model years of the W300.
Both the 1156 and the 199 are ANSI-standard bulbs recognized in the US and Canada, operating at 12 volts with a 21-watt output.
Each bulb is a single-filament type, meaning it serves one lighting function rather than combining two functions such as stop and tail into a single unit.
Both bulbs share the BA15s bayonet base, a single-contact base design where the "s" denotes a single contact at the base tip, distinguishing it from the dual-contact BA15d variant.
The 199 is classified as a variant of the 1156, sharing identical electrical ratings and the same base type, which reflects a close physical and functional relationship between the two part numbers.
The 1975 and 1977 model years of the Dodge W300 are specified with the 199 bulb rather than the 1156, making those two years distinct within this fitment group.
Because the 199 is a variant of the 1156 with matching voltage, wattage, and base specifications, the two bulbs occupy the same general technical category, though fitment should follow the year-specific specification rather than assuming full interchangeability.