The Plymouth Turismo brake light utilizes 1157 and 2057 bulb sizes for the rear lighting system. Data for the specific components covers the period from 1983 through 1987.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Turismo brake light specifications cover two distinct bulb types across the 1983-1987 model years: the 1157 and the 2057, both of which are dual-filament bulbs sharing the BAY15d bayonet base.
The BAY15d bayonet base is a two-pin offset base design that physically accommodates both the 1157 and 2057 bulbs, though the two types are not electrically interchangeable due to differing wattage ratings.
The 1157 operates at 12V with a 21W/5W dual-filament output, where the higher wattage filament serves the stop function and the lower wattage filament serves the running light function.
The 2057 operates at 12V with a 26.9W/8W output, making both of its filaments draw more power than the corresponding filaments of the 1157. The Plymouth Turismo uses the 2057 for the 1983-1984 model years.
The 1157 is specified for the brake light position on the 1985-1987 Turismo, representing a shift from the higher-wattage 2057 used in the earlier model years.
The center high mount stop light (CHMSL) on the 1985 Turismo uses the 1157, while the 1986-1987 model years use the 912 wedge bulb in that same position, making the two bulb types physically and electrically incompatible with each other.
The 912 is a single-filament T15 wedge bulb rated at 12V and 12W. Unlike the 1157 and 2057, it has no dual-filament capability, which is consistent with its use in a dedicated stop light rather than a combined stop and running light application.
The 912 is classified as a variant of the 921 bulb. Both share the T15 wedge form factor, though they differ in wattage, meaning substitution between the two would affect light output.
All three bulb types specified for the Turismo conform to ANSI standards applicable in both the United States and Canada, indicating standardized electrical and photometric performance requirements.
The CHMSL position on the Turismo accepts different bulb types depending on the model year, which means fitment of a replacement bulb requires confirmation of the specific year before selection.