Plymouth Caravelle front and rear turn signal bulbs utilize 2057 and 2057NA sizes, with front signals accommodating both bulb options and rear signals using the 2057 bulb size. The replacement chart covers 1985 to 1988 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 Plymouth Caravelle uses the 2057 bulb for both front and rear turn signals across the 1986-1988 model years, making it the dominant bulb type in these specifications.
The 2057 is an ANSI-standard dual-filament bulb rated at 12V with a wattage split of 26.9W for the high-intensity filament and 8W for the low-intensity filament, allowing it to serve both turn signal and parking light functions from a single housing.
The 2057 uses a BAY15d bayonet base, a two-pin offset base design that physically prevents incorrect installation by positioning the pins at different heights.
The 2057 is described as a brighter variant of the 1157, meaning the two types share the same BAY15d base and dual-filament configuration but differ in output, which is a known source of substitution errors.
The 1985 Plymouth Caravelle front turn signal position specifies the 2057NA rather than the standard 2057 used in all other positions and years.
The 2057NA carries the same ANSI dual-filament specification and BAY15d base as the 2057 but is distinguished by natural amber glass, which produces the amber turn signal color through the glass itself rather than through a colored lens.
Because the 2057 and 2057NA share the same base and electrical ratings, they are physically interchangeable, though substituting a clear 2057 in a position designed for the 2057NA may alter the color output if the lens is also clear.
The rear turn signal position for the 1985 model year calls for the standard 2057, while the front position for that same year calls for the 2057NA, indicating that the two positions were not treated as interchangeable by the original specification.