Volkswagen Rabbit Convertible Turn Signal Bulb Size
Volkswagen Rabbit Convertible front turn signal bulbs utilize a P21/5W size while rear turn signal bulbs use a P21W size. The replacement chart covers 1980 to 1984 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volkswagen Rabbit Convertible uses two distinct bulb types across its turn signal system for the 1980-1984 model years: P21/5W at the front and P21W at the rear.
The P21/5W is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base.
The BAY15d base features two offset pins at different heights, a design that prevents incorrect insertion and ensures the two filaments are oriented to their correct circuits.
The P21W is a single-filament bulb rated at 12V and 21W, mounted on a BA15s bayonet base, which uses a single contact pin.
Because the front P21/5W uses a BAY15d base and the rear P21W uses a BA15s base, the two bulb types are not physically interchangeable with each other.
Both bulb types conform to ECE standards, a regulatory framework used across Europe and numerous other markets worldwide.
The shared 21W output rating between the two bulb types reflects a common signalling brightness standard, though the P21/5W carries an additional 5W filament that the P21W does not.
The front P21/5W fitment on the Volkswagen Rabbit Convertible suggests the front turn signal housing was designed to support a dual-filament function, such as combining turn signal and parking light duties within a single bulb.