The Plymouth PB350 front and rear turn signal bulbs both utilize a 1157 size bulb for proper operation. The replacement chart covers vehicle production spanning 1981 to 1983.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 is the sole bulb type across all listed positions for the Plymouth PB350, covering both the front and rear turn signal applications for the 1981-1983 model years.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope, allowing it to serve two distinct lighting functions from one unit.
The 1157 operates on a 12-volt electrical system and draws 21 watts on its high-intensity filament and 5 watts on its low-intensity filament, reflecting its dual-function design.
The 1157 uses a BAY15d bayonet base, which is an offset twin-pin mount. The asymmetric pin placement of the BAY15d base is a deliberate design feature that prevents incorrect installation orientation.
The 1157 carries ANSI standardization applicable in both the United States and Canada, indicating it conforms to a defined set of electrical and physical specifications recognized across North American markets.
Because the 1157 is used in both the front and rear turn signal positions on the Plymouth PB350, a single bulb type services all four turn signal sockets on the vehicle across the 1981-1983 model years.
The BAY15d base of the 1157 is not interchangeable with single-filament bayonet bases such as the BA15s, as the pin count and offset configuration differ between those base types.