Plymouth TC3 front and rear turn signal bulbs utilize 2057NA, 1157, and P21W bulb sizes depending on location and model configuration. The replacement chart covers 1980 to 1982 production 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 most frequently specified bulb across the Plymouth TC3 turn signal positions, appearing in the front for 1980-1981 and the rear for 1981-1982.
The 1157 is an ANSI-standard dual-filament bulb rated at 12V with a 21W high filament and 5W low filament, fitted with a BAY15d bayonet base.
The 2057NA is specified for the Plymouth TC3 front turn signal in 1982. It shares the BAY15d bayonet base with the 1157 but produces a higher output at 26.9W/8W and features natural amber glass rather than a clear envelope.
Because the 2057NA and 1157 share the same BAY15d bayonet base, they are physically interchangeable at the socket level, though their wattage ratings differ.
The natural amber glass of the 2057NA produces a colored output without relying on an amber lens, which is relevant when the housing uses a clear or non-tinted lens.
The P21W is specified for the Plymouth TC3 rear turn signal in 1980. Unlike the 1157 and 2057NA, it is a single-filament bulb and follows the ECE standard rather than the ANSI standard.
The P21W uses a BA15s bayonet base, which is a single-contact fitting. The 1157 and 2057NA use a BAY15d base, which is a dual-contact fitting with offset pins. These two base types are not interchangeable.
The shift from P21W to 1157 in the rear turn signal position between 1980 and 1981 represents a change from a single-filament ECE-standard bulb to a dual-filament ANSI-standard bulb, which involves a different base type and socket configuration.