Ford Thunderbird Turn Signal Bulb Size

Additional Notes

• The Ford Thunderbird front turn signal uses the 3457NA bulb for the 2002-2005 model years. This is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and 7W low filament, featuring natural amber glass that produces the amber color required for turn signals without a tinted lens.
• The 3157NA bulb serves the front turn signal position on the Ford Thunderbird for the 1988-1997 model years. It shares the same T25 wedge form factor, 12V operating voltage, and 27W/7W dual-filament rating as the 3457NA, differing only in its ANSI designation number.
• The 1157NA is a recurring front turn signal bulb across multiple non-consecutive Thunderbird model years spanning 1964-1984. It uses a BAY15d bayonet base, operates at 12V, and carries a 21W/5W dual-filament rating with natural amber glass coloring.
• The 1034NA bulb appears in the front turn signal position across several Thunderbird model years from 1967 through 1983. It is classified as a variant of the 1157 and shares the same BAY15d bayonet base and 12V, 21W/5W dual-filament output, also with natural amber glass.
• The 1034 and 1034NA are variants of the same base type, differing only in glass color. The 1034 has clear glass and was used in the front turn signal position on the Thunderbird from 1956-1962, while the 1034NA with amber glass was used in later years where amber coloring was required.
• The 1955 Ford Thunderbird uses the 1154 bulb in both the front and rear turn signal positions. The 1154 is an older dual-filament BAY15d bayonet bulb described as a predecessor to the 1157 type, and it is rated for both 6V and 12V operation, reflecting the transitional electrical system standards of that era.
• The rear turn signal on the Ford Thunderbird uses the 3157 bulb for the 2002-2005 model years, as well as for several earlier years including 1987-1991, 1995-1996. The 3157 is a dual-filament T25 wedge bulb rated at 12V and 27W/7W, identical in output to the 3457NA but without the natural amber glass coating.
• The 3357 bulb appears in the rear turn signal position on the Thunderbird for the 1992-1994 and 1997 model years. Unlike the 3157 and 3457NA, the 3357 is a single-filament T25 wedge bulb rated at 12V and 27W, meaning it does not support a separate parking light function from the same bulb.
• The 2057 bulb is specified for the rear turn signal on the 1983-1984 Thunderbird. It uses a BAY15d bayonet base and is described as a brighter variant of the 1157, with a dual-filament rating of 12V and 26.9W/8W, placing its output closer to the 2357NA than to the standard 1157.
• The 1157 bulb, without the NA amber glass designation, is used in the rear turn signal position across a wide span of Thunderbird model years from 1963 through 1986. It operates at 12V with a 21W/5W dual-filament rating and a BAY15d bayonet base, and it is not interchangeable with the 1034 or 1034NA despite sharing the same base type, as those are distinct ANSI variants.