Nissan Armada Turn Signal Bulb Size

Additional Notes

• The 7444NA and 7440NA bulbs share the same T20 wedge form factor and operate at 12V, but they differ in filament count. The 7444NA is dual-filament (21W/5W) while the 7440NA is single-filament (21W), making them non-interchangeable despite their physical similarity.
• The Nissan Armada (2017-2020) uses the 7444NA for the front turn signal and the 7440NA for the rear turn signal, both carrying natural amber glass. This coloring produces an amber output without relying on an amber-tinted lens.
• The 3457 and 3157NA are both T25 dual-filament wedge bulbs rated at 12V, 27W/7W. The key distinction is that the 3157NA incorporates natural amber glass while the 3457 does not, meaning the two are not direct substitutes where amber output is required by the lens design.
• The front turn signal on the Armada (2008-2015) uses the 3457, a clear-glass T25 dual-filament bulb. The 2005-2007 models instead use the 3157NA, which shares the same T25 form factor and wattage but adds natural amber glass.
• The 2356 and 3156 are both single-application rear turn signal bulbs rated at 12V, but they differ in base type. The 2356 uses a BAY15d bayonet base and is dual-filament, while the 3156 is a single-filament T25 wedge bulb rated at 27W. These two types are not interchangeable.
• The rear turn signal of the Nissan Armada varies across model years between the 2356, 2456, and 3156 bulb types, with no single bulb type used consistently across the 2005-2015 range. Substituting one for another without confirming the correct year-specific fitment risks an improper installation.
• The 2456 is classified as a festoon bulb intended for specialty applications, which differs structurally from both the wedge and bayonet-base bulbs used elsewhere in the Armada's turn signal system. It is used in the rear turn signal position for the 2005, 2007-2008, 2011, and 2013 model years.
• All bulb types listed across both front and rear turn signal positions conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances within that regulatory framework.
• The dual-filament bulbs in this specification, including the 7444NA, 3457, 3157NA, and 2356, serve positions where a single housing handles more than one lighting function, such as combining turn signal and parking light duties within one socket.
• The T20 and T25 designations refer to the bulb's tubular envelope size, with T25 being physically larger than T20. Sockets designed for one size do not accept the other, which is relevant when comparing the 2017-2020 bulbs against those used in earlier Armada model years.