Honda Ridgeline Turn Signal Bulb Size

Additional Notes

• The front turn signal specifications for the Honda Ridgeline span the 2006-2024 model years and reference six distinct bulb types: 2357NA, 7444NA, 7443NA, 3457NA, 3357NA, and 3457NA, while the rear turn signal position uses the 7440 across all listed model years.
• The 3457NA is the most frequently specified front turn signal bulb, covering the 2006-2014 model years with the exception of 2008, which uses the 3357NA instead.
• The 3357NA used in the 2008 Ridgeline front turn signal is a single-filament T25 wedge bulb rated at 12V and 27W, whereas the 3457NA used in surrounding model years is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and a 7W low filament. These two bulbs share the same T25 wedge base and wattage on the primary filament, but the 3357NA lacks the secondary filament present in the 3457NA.
• The 7443NA and 7444NA are both dual-filament T20 wedge bulbs rated at 12V with a 21W high filament and a 5W low filament, and both carry the NA designation indicating natural amber glass. The 7443NA is specified for the 2017-2019 Ridgeline front turn signal, while the 7444NA is specified for the 2020 and 2023 model years. Despite their near-identical electrical ratings, these are distinct ANSI part numbers and are not confirmed as interchangeable by the specifications.
• The 2024 Ridgeline front turn signal uses the 2357NA, a dual-filament bulb with a BAY15d bayonet base rated at 12V with a 26.9W high filament and an 8W low filament. The BAY15d base type differs from the T20 and T25 wedge bases used in all other listed front turn signal positions, making the 2357NA physically incompatible with sockets designed for wedge-base bulbs.
• The NA suffix present on the 2357NA, 7444NA, 7443NA, 3457NA, and 3357NA designations indicates natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by a coating or the housing. The 7440 specified for the rear turn signal position carries no NA suffix, indicating a clear glass envelope.
• The 7440 is a single-filament T20 wedge bulb rated at 12V and 21W. Its single-filament configuration contrasts with the dual-filament 7443NA and 7444NA, which share the same T20 wedge base. This means a 7443NA or 7444NA is not a direct drop-in replacement for the 7440 rear turn signal position without accounting for the differing filament configuration.
• All bulb types listed across both the front and rear turn signal positions conform to ANSI standards applicable to the United States and Canada, operating on a 12V electrical system consistent with standard automotive applications.