The Plymouth PB150 front and rear turn signal bulbs both utilize a 1157 size bulb for proper operation. The replacement chart covers 1981 to 1983 model years with corresponding bulb size specifications.
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 listed across all turn signal positions for the Plymouth PB150, covering model years 1981-1983.
The 1157 is a dual-filament bulb, meaning it serves two lighting functions within a single unit. In a turn signal application, the lower-wattage filament typically handles a parking or running light function, while the higher-wattage filament handles the active turn signal flash.
The 1157 operates at 12 volts with a wattage rating of 21W for the primary filament and 5W for the secondary filament, conforming to standard automotive electrical systems of that era.
The 1157 uses a BAY15d bayonet base, which is an offset dual-contact base. The two pins on the base are positioned at different heights, which prevents the bulb from being inserted in the wrong orientation.
The 1157 carries ANSI standardization recognized in both the United States and Canada, indicating a consistent specification across North American markets.
The front and rear turn signal positions on the Plymouth PB150 (1981-1983) share the same 1157 bulb specification, meaning a single bulb type services both locations on the vehicle.
Because the 1157 is a dual-filament design with an offset bayonet base, it is not directly interchangeable with single-filament bulbs such as the 1156, which uses a similar but non-offset BAY15s base with only one contact.