Dodge D350 Back Up Light Bulb Size

The Dodge D350 back up light uses 1156 and P21W bulb sizes for the rear illumination system. Data for the specified vehicle covers the period from 1981 through 1993.

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
1981-1993	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 D350 uses the 1156 bulb for the back up light across all listed model years, spanning 1981-1993.
The 1156 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
This bulb operates on a 12-volt electrical system, which is consistent with standard automotive DC voltage found in passenger and light commercial vehicles.
The 1156 carries a 21-watt rating, placing it in a mid-range output category typical of single-function exterior lighting such as back up lamps.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width, distinguishing it from dual-contact variants that are not interchangeable with this socket type.
The single-filament construction of the 1156 means it serves one lighting function only, unlike dual-filament bulbs that handle two functions such as braking and running light within a single housing.
Because the BA15s base is a single-contact design, substituting a dual-contact bayonet bulb such as the 1157 in the Dodge D350 back up light socket would result in an incompatible fit.