The Dodge Colt front turn signal uses a 1157 bulb size, while rear turn signal applications accommodate either 1156 or 1157 bulb sizes. The replacement chart covers 1971 through 1994 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 Dodge Colt front turn signal position uses the 1157 bulb across all listed model years from 1971-1994.
The 1157 is a dual-filament bulb operating at 12 volts, with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base.
The BAY15d base features two offset pins at different heights, which physically prevents incorrect insertion and distinguishes it from single-filament bases.
The rear turn signal position on the Dodge Colt uses the 1157 bulb for model years 1971-1978, then transitions to the 1156 bulb for 1979-1985 and 1992-1994.
The 1156 is a single-filament bulb operating at 12 volts with a 21W output, mounted on a BA15s bayonet base.
The BA15s base uses two pins at equal heights, making it incompatible with the BAY15d socket used by the 1157 bulb, despite the two types sharing a similar overall form.
Because the 1156 and 1157 use different base configurations, the two bulb types are not interchangeable, even though both operate at 12 volts and share the same main filament wattage of 21W.
Both the 1156 and 1157 are classified under ANSI standards and are recognized across the United States and Canada, reflecting a standardized sizing system used throughout the North American automotive market.