Dodge W350 Back Up Light Bulb Size

The Dodge W350 back up light utilizes 1156 and P21W bulb sizes depending on the specific production period for the vehicle. Data for the bulb sizes covers the range 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 W350 uses the 1156 bulb for the back up light across all listed model years, spanning 1981-1993.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than combining two, such as stop and tail, into a shared housing.
It operates on a 12-volt electrical system at 21 watts, which is consistent with standard automotive incandescent output for reverse lighting applications.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width.
The BA15s base is not interchangeable with the BA15d base, which is a dual-contact variant used on two-filament bulbs such as the 1157.
The 1156 is an ANSI-standardized bulb recognized in both the United States and Canada, indicating consistent specification requirements across North American markets.