American Motors Pacer front and rear turn signal bulbs utilize a 1157 size bulb for both locations. The replacement chart covers 1975 through 1980 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 American Motors Pacer uses the 1157 bulb for both front and rear turn signals across all model years from 1975-1980.
The 1157 is an ANSI-standardized bulb type, meaning its specifications are governed by a formal industry standard recognized across the United States and Canada.
The 1157 is a dual-filament bulb, which means it contains two separate filaments within a single housing, allowing it to serve more than one lighting function from a single socket.
The 1157 operates on a 12-volt electrical system, consistent with the standard automotive electrical architecture of that era.
Its two filaments are rated at 21 watts and 5 watts respectively, with the higher-wattage filament typically serving the active turn signal function and the lower-wattage filament serving a parking or running light function.
The 1157 uses a BAY15d bayonet base, which is an offset dual-contact base design. The offset pin placement prevents the bulb from being inserted in an incorrect orientation.
Because the same 1157 bulb is specified for both the front and rear turn signal positions on the American Motors Pacer, the two positions share a common replacement bulb across all six model years covered.