The Yugo GVX uses 1157 bulb size for both front and rear turn signal applications. A replacement chart covering 1987 to 1989 model years documents the turn signal bulb specifications for this vehicle.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 is the bulb type used across all listed positions and model years for the Yugo GVX, covering both front and rear turn signal applications from 1987-1989.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve two distinct lighting functions at different wattages.
The 1157 operates on a 12-volt electrical system, which is standard for passenger vehicles of this era.
Its two filaments draw 21 watts and 5 watts respectively, with the higher-wattage filament typically associated with the active turn signal flash and the lower-wattage filament associated with a parking or running light function.
The 1157 uses a BAY15d bayonet base, a two-pin offset base design that prevents incorrect insertion by ensuring the pins are not symmetrically placed, which physically enforces correct filament-to-circuit alignment.
The 1157 is an ANSI-standardized type recognized in both the United States and Canada, meaning bulbs sold under this designation conform to a defined set of electrical and physical specifications regardless of manufacturer.
Because the Yugo GVX (1987-1989) uses the same bulb type in both the front and rear turn signal positions, a single replacement bulb type services all four turn signal sockets on the vehicle.
The BAY15d base is not interchangeable with the similarly named BA15d base, as the offset pin placement of the BAY15d is a deliberate fitment distinction that prevents substitution with single-contact or symmetrical-pin bayonet bulbs.