Porsche 924 License Plate Bulb Size

The Porsche 924 license plate light requires a 3893 bulb size for proper illumination of the rear registration area. Available data for the specified component covers the period from 1977 through 1988.

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
1987-1988	3893
1977-1982	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 3893 is the sole bulb type listed across all model years of the Porsche 924 in these specifications, covering the 1977-1982 and 1987-1988 model years.
The 3893 bulb follows the ANSI standard, meaning it conforms to a defined set of electrical and physical criteria recognized across the United States and Canada.
The 3893 operates at 12 volts, which is consistent with the standard electrical system voltage found in passenger vehicles of this era.
The 3893 is a dual-filament bulb, meaning it contains two separate filaments within a single housing, each capable of serving a distinct lighting function.
The 3893 uses a BAY15d bayonet base, a two-pin offset bayonet mount where the two pins are positioned at different heights to prevent incorrect installation orientation.
The BAY15d base type is directly tied to the dual-filament design, as the offset pin configuration ensures each filament connects to the correct circuit.
The 3893 is classified as a specialty application bulb, indicating it is not among the most broadly distributed bulb types and may require sourcing from suppliers that stock less common automotive lighting components.
Because the BAY15d base uses an offset pin layout, substituting a single-filament bulb with a standard BAY15s base would result in an incompatible fitment for the Porsche 924 license plate socket.