Dodge Ramcharger Back Up Light Bulb Size

The Dodge Ramcharger back up light utilizes 1156 and P21W bulb sizes according to the provided specifications for the lighting components. Available information covers the range from 1974 through 1993 for the specified vehicle and lighting equipment.

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
1974-1993	1156

Bulb Specifications

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

Other Locations

Additional Notes

The Dodge Ramcharger uses the 1156 bulb for the back up light position across all model years listed in the specifications, spanning 1974-1993.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than combining two, such as stop and tail duties, into a single unit.
The 1156 operates at 12 volts and 21 watts, which places it in the mid-range output category typical of incandescent reverse lighting applications.
The bulb 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 single-filament construction.
The 1156 carries ANSI standardization, indicating its physical and electrical characteristics conform to a defined specification recognized in both the United States and Canada.
Because the 1156 is an ANSI-standardized type, it is produced by multiple manufacturers, and units from different sources are generally interchangeable provided the BA15s base and 12V/21W ratings are matched.
The BA15s base should not be confused with the BA15d base, which is a dual-contact variant. Substituting a BA15d bulb in a BA15s socket is not compatible due to the differing contact configurations.