Plymouth PB200 Back Up Light Bulb Size

The Plymouth PB200 back up light requires bulb size 1156 or P21W depending on the specific version of the vehicle. Data for the back up light covers the range from 1975 to 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
1975-1980	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 1156 is the sole bulb type listed across all model years in these specifications, covering the Plymouth PB200 from 1975-1980.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is standard for incandescent backup light applications in vehicles of this era.
As a single-filament bulb, the 1156 serves one dedicated function per socket, distinguishing it from dual-filament types that handle multiple lighting roles simultaneously.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. The single-contact design is directly tied to its single-filament construction.
The 1156 carries ANSI standardization recognized in both the United States and Canada, meaning the bulb conforms to a defined set of electrical and physical tolerances shared across compliant manufacturers.
Because the BA15s base is a single-contact type, it is not interchangeable with BA15d sockets, which require a dual-contact base. Substituting one for the other is not physically compatible.