Plymouth Reliant front and rear turn signal bulbs utilize 2057 and 2057NA sizes for front applications, with rear positions requiring either 2057 or 1156 bulb sizes. The replacement chart covers 1981 through 1989 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 2057 bulb is the most widely used type across the Plymouth Reliant's turn signal specifications, appearing in both front and rear positions across nearly all model years covered.
The 2057 is a dual-filament bulb rated at 12V with a high-intensity filament drawing 26.9W and a low-intensity filament drawing 8W, mounted on a BAY15d bayonet base.
The 2057NA variant, specified for the front turn signal on the 1982-1984 Reliant, is functionally identical to the 2057 but features natural amber glass rather than a clear envelope.
Because the 2057NA uses amber glass to produce its color, it serves the same electrical role as the 2057 while achieving the amber output through the bulb itself rather than a colored lens.
The 1981 Plymouth Reliant rear turn signal uses the 1156, a single-filament bulb rated at 12V and 21W with a BA15s bayonet base, which differs from the dual-filament 2057 used in all subsequent rear turn signal positions.
The BA15s base of the 1156 and the BAY15d base of the 2057 are not interchangeable. The BA15s has a single locating pin, while the BAY15d has two offset pins, meaning the sockets for each bulb type are physically distinct.
The 2057 is described as a brighter variant of the 1157, sharing the same BAY15d base and dual-filament design but offering higher output on the low-intensity filament.
All three bulb types in these specifications conform to ANSI standards recognized in both the United States and Canada.