American Motors Javelin front and rear turn signal bulbs both utilize a 1157 size bulb for optimal lighting performance. The replacement chart covers vehicle production spanning 1968 to 1974.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The American Motors Javelin uses the 1157 bulb for both front and rear turn signals across all listed model years, spanning 1968-1974.
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 glass envelope, allowing it to serve more than one lighting function from a single socket.
The 1157 operates on 12 volts and carries a wattage rating of 21W for the high-intensity filament and 5W for the low-intensity filament, reflecting its dual-function design.
The 1157 uses a BAY15d bayonet base, a two-pin offset base type where the two pins are positioned at different heights to prevent incorrect installation orientation.
Because the American Motors Javelin (1968-1974) uses the same 1157 bulb in both the front and rear turn signal positions, a single bulb type services all four turn signal sockets on the vehicle.
The BAY15d base of the 1157 is not interchangeable with single-filament bayonet-base bulbs such as the 1156, which uses a BAY15s base with pins at equal heights, despite the physical similarity of the two base styles.