American Motors Deluxe Back Up Light Bulb Size

The American Motors Deluxe back up light requires a P21W bulb size for the specific lighting assembly located at the rear of the vehicle. Data for the bulb specifications covers the range from 1961 to 1962.

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
1961-1962	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The P21W is the specified back up light bulb for the American Motors Deluxe across the 1961-1962 model years.
The P21W follows the ECE (Economic Commission for Europe) standard, a regulatory framework used across Europe and numerous other markets worldwide.
This bulb operates on a 12-volt electrical system and draws 21 watts, placing it in the single-filament category typical of directional and signalling applications.
The BA15s designation refers to a bayonet-style base with a 15mm collar and a single locating pin, which physically locks the bulb into its socket with a push-and-twist motion.
Because the BA15s base uses a single pin, it is not interchangeable with the BA15d variant, which carries two offset pins and is designed for dual-filament bulbs.