Oldsmobile Jetfire Back Up Light Bulb Size

The Oldsmobile Jetfire back up light requires a P21W bulb size for the rear lighting system. Data for the specified component covers the period from 1962 through 1963.

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
1962-1963	P21W

Bulb Specifications

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

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Additional Notes

The P21W is the specified back up light bulb for the Oldsmobile Jetfire across its full production run of 1962-1963.
The P21W follows the ECE (Economic Commission for Europe) standard, a regulatory framework governing automotive lighting across Europe and numerous other markets worldwide.
This bulb operates on a 12-volt electrical system and draws 21 watts, which is characteristic of a single-filament signalling application.
The P21W uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, distinguishing it from double-contact variants that are not interchangeable with this fitment.
Because the BA15s base is a single-contact design, substitution with a BA15d (double-contact) bulb of otherwise similar appearance is not compatible with this application.