Nissan LEAF Turn Signal Bulb Size

Additional Notes

• The Nissan LEAF turn signal specifications reference five distinct bulb types across all positions and model years: 3457NA, 3357NA, 7444NA, 7440NA, and 3757NA. All five follow ANSI standards applicable to the US and Canadian markets and use natural amber glass rather than a clear envelope with a separate amber lens.
• The T25 and T20 designations indicate the wedge base size of the bulb. T25 bulbs, such as the 3457NA, 3357NA, and 3757NA, are physically larger than T20 bulbs such as the 7444NA and 7440NA. These two base sizes are not interchangeable, as the wedge tab widths differ.
• Within the T25 family used in the Front Inner Turn Signal position, the 3457NA is a dual-filament bulb rated at 27W and 7W, while the 3357NA is a single-filament bulb rated at 27W only. The 2016 Nissan LEAF Front Inner Turn Signal takes the 3357NA, whereas all other model years from 2011-2018 in that position take the 3457NA. Substituting a dual-filament 3457NA for a 3357NA, or vice versa, risks incorrect circuit behavior even though both share the T25 base.
• Within the T20 family, the 7444NA is dual-filament at 21W and 5W, while the 7440NA is single-filament at 21W. Although both share the T20 wedge base, their filament configurations differ, and using one in place of the other can cause wiring or load issues depending on the socket circuit design.
• The Front Turn Signal position on the Nissan LEAF shows a notable split between model years. The 2011-2017 range uses T25-based bulbs (3757NA or 7440NA), while the 2018-2024 range transitions to T20-based bulbs (7444NA or 7440NA). This reflects a physical socket change between generations and means parts from earlier model years are not directly transferable to later ones in this position.
• The Rear Turn Signal position uses exclusively T20 bulbs across all model years from 2011-2024, with the 7440NA single-filament bulb covering most years and the 7444NA dual-filament bulb appearing in 2024.
• Two Front Turn Signal entries carry location notes within the specifications. The 2013 model year lists the 7440NA as fitted "In Headlamp," and the 2011 model year lists the 3757NA similarly as "In Headlamp," indicating the turn signal bulb is housed within the headlamp assembly rather than in a separate turn signal housing for those years.
• The 3757NA bulb, used in the Front Turn Signal position for the 2011-2015 and 2016-2017 model years, is listed as a dual-filament T25 wedge at 12V but without a specified wattage rating in the provided descriptions, distinguishing it from the otherwise fully rated 3457NA and 3357NA bulbs in the same T25 family.