Acura MDX Turn Signal Bulb Size

Additional Notes

• The 7440 is the most frequently specified bulb across these turn signal positions. It is a single-filament T20 wedge bulb rated at 12V and 21W, and it serves as the rear turn signal for the Acura MDX across the 2007-2020 model years.
• The "NA" suffix on bulb codes such as 7440NA, 7443NA, 1034NA, and 1157NA denotes natural amber glass. This coloring is built into the glass envelope itself rather than applied through a lens or coating.
• The 7443NA and 7440NA are both T20 wedge bulbs sharing the same base type, but they are not interchangeable. The 7443NA carries a dual filament rated at 21W/5W, while the 7440NA carries a single filament rated at 21W. Installing a single-filament bulb in a socket wired for dual-filament operation would result in the loss of one electrical function.
• The front turn signal of the Acura MDX shifted from the 7440NA to the 7443NA between the 2012 and 2013 model years, representing a change from a single-filament to a dual-filament configuration.
• The 3457 is a T25 wedge bulb with a dual filament rated at 27W/7W, making it the highest-wattage bulb specified in these listings. It served as the front turn signal for the 2004-2006 model years.
• The 3497 uses a BA15s single-contact bayonet base and is noted as a variant of the 1156. It was specified for the front turn signal on the 2001-2003 MDX, making it the only front turn signal bulb in these specifications that uses a bayonet base rather than a wedge base.
• The 1157NA and 1034NA both use the BAY15d dual-contact bayonet base and share the same 21W/5W power rating. The 1034NA is listed as a variant of the 1157NA, and both were used in the rear turn signal position on early MDX model years.
• The rear turn signal for the 2006-2008 MDX used the 7440NA, which includes the natural amber glass of the NA designation. The 2009-2020 rear turn signal used the standard 7440, which lacks that amber glass treatment despite being otherwise identical in filament and voltage specifications.