The INFINITI G37 front turn signal requires a 7440NA or 7444NA bulb size, while the rear turn signal uses a 7440 bulb size. The replacement chart covers vehicle production spanning 2008 to 2013 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440, 7440NA, and 7444NA bulbs specified for the Infiniti G37 all belong to the T20 wedge family and share the same ANSI standard classification for the US and Canadian markets.
The 7440NA and 7440 are both single-filament T20 wedge bulbs rated at 12V and 21W, with the key distinction being that the 7440NA incorporates natural amber glass, which produces an amber light output without the need for an amber-tinted socket or housing.
The 7444NA is a dual-filament T20 wedge bulb rated at 12V with a 21W high filament and a 5W low filament, making it functionally distinct from the single-filament 7440NA despite sharing the same natural amber glass construction.
The Infiniti G37 front turn signal for the 2009 model year uses the 7444NA, a dual-filament bulb, while the 2008 and 2010 model years use the single-filament 7440NA. These bulbs are not directly interchangeable due to the filament count difference.
Although the 7440 and 7440NA share identical electrical ratings and filament configurations, substituting one for the other affects light color output, as the 7440 relies on the housing or lens for amber coloring rather than the glass envelope itself.
The rear turn signal position on the G37 uses the 7440 across all listed model years from 2008-2013, indicating a consistent single-filament, clear-glass wedge bulb fitment for that position throughout the production span covered by these specifications.
The front turn signal position shows variation across the three listed model years, with two different bulb sizes appearing, which means the 2009 model year front fitment is not interchangeable with the 2008 or 2010 fitment without accounting for the filament count difference.