Porsche 914 License Plate Bulb Size

The Porsche 914 license plate light requires a 3893 bulb size for proper illumination of the rear registration area. Available data for the specified component covers the range from 1970 to 1976.

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
1970-1976	3893

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, specialty application. 12V.	3893

Other Locations

Additional Notes

The Porsche 914 uses the 3893 bulb for its license plate lighting across all model years covered by these specifications, spanning 1970-1976.
The 3893 is an ANSI-standardized bulb, meaning it conforms to a defined set of electrical and physical standards recognized across the United States and Canada.
This bulb operates on a 12-volt electrical system, which is consistent with the standard automotive voltage found in most passenger vehicles of this era.
The 3893 features a dual-filament design, meaning it contains two separate filaments within a single bulb envelope, each capable of operating independently.
A dual-filament configuration in a license plate bulb is considered a specialty application, as most license plate bulbs use a simpler single-filament design.
The 3893 uses a BAY15d bayonet base, which is an offset double-contact bayonet mount. The offset pin arrangement prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The BAY15d base is a distinct fitment from the more common BA15s and BA15d bayonet bases. Substituting a bulb with a non-offset or single-contact base would result in an incompatible fit.