Dodge D50 Back Up Light Bulb Size

The Dodge D50 back up light requires 1156 and P21W bulb sizes for the specific lighting components. Data for the specified vehicle covers the range from 1979 through 1982.

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
1979-1982	1156

Bulb Specifications

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

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Additional Notes

The 1156 is the sole bulb type listed across all model years of the Dodge D50 back up light specifications covered, spanning 1979-1982.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than sharing a housing with a dual-purpose filament for combined stop and tail duties.
The 1156 operates on a 12-volt electrical system at 21 watts, which is consistent with standard automotive low-voltage architecture of that era.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. The single-contact design corresponds directly to the bulb's single-filament construction.
The 1156 carries ANSI standardization applicable to the United States and Canada, indicating the bulb conforms to a defined set of dimensional and electrical tolerances recognized across North American markets.
Because the BA15s base is a single-contact fitting, it is not interchangeable with the BA15d base, which is a dual-contact bayonet of the same 15mm width used on double-filament bulbs.