The American Motors AMX front turn signal utilizes bulb sizes 1157, 1034NA, and 1157NA, while the rear turn signal requires 1156 or 1157 bulb sizes. The replacement chart covers vehicle production spanning 1968 to 1980.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 bulb is the most frequently specified type across the American Motors AMX turn signal positions, appearing in both the front and rear turn signal roles across multiple model years.
The 1157 is a dual-filament bulb rated at 12V with a 21W/5W output and uses a BAY15d bayonet base, which features two offset pins to ensure correct orientation during installation.
The 1157NA, specified for the 1968 AMX front turn signal, shares the same 12V, 21W/5W rating and BAY15d base as the standard 1157 but is distinguished by its natural amber glass envelope, which produces a colored output without relying on a separate amber lens.
The 1034NA, used in the 1969-1970 AMX front turn signal position, is also a dual-filament BAY15d bulb with natural amber glass and is classified as a variant of the 1157, meaning it shares the same base type and general electrical characteristics.
Despite the 1034NA being a variant of the 1157, the two are not necessarily interchangeable in all applications, as the NA designation indicates a factory-specified amber glass construction that affects light color output at the source.
The 1156 bulb, specified for the 1978-1980 AMX rear turn signal, is a single-filament type rated at 12V and 21W, using a BA15s bayonet base with a single center pin rather than the offset dual-pin BAY15d base found on the 1157 family.
Because the 1156 uses a BA15s base and the 1157 uses a BAY15d base, these two bulb types are not physically interchangeable despite sharing a similar cylindrical form and voltage rating.
The front and rear turn signal positions on the 1969-1970 AMX use different bulb types, with the 1034NA at the front and the 1157 at the rear, indicating that the two positions are not served by the same bulb in those years.
All four bulb types listed across these specifications conform to ANSI standards applicable in both the United States and Canada, placing them within a standardized North American automotive lighting classification system.
The shift from 1157 to 1156 in the rear turn signal position between the 1970 and 1978 AMX reflects a change from a dual-filament to a single-filament rear turn signal bulb over that period.