Mazda Tribute Turn Signal Bulb Size

Additional Notes

• The Mazda Tribute front turn signal uses the 3157NA bulb across model years 2001-2006 and 2008-2009, making it the most consistently specified bulb in these turn signal fitments. It is a dual-filament T25 wedge bulb rated at 12V and 27W/7W with natural amber glass, conforming to ANSI standards for the US and Canada.
• The 3357NA and 3457NA bulbs specified for the 2011 and 2010 front turn signals share the same T25 wedge form factor and 12V/27W rating as the 3157NA, but the 3357NA is single-filament while the 3457NA is dual-filament. Despite physical similarities, these are not interchangeable with each other or with the 3157NA due to differences in filament count and wattage configuration.
• The rear turn signal on the Mazda Tribute uses the 4157 bulb for model years 2008-2011. This is a dual-filament T25 wedge bulb rated at 12V and 27W/7W, conforming to ANSI standards, though it does not carry the natural amber glass designation found on the NA-suffix bulbs.
• The 7440NA, specified for the 2005-2006 rear turn signal, is a single-filament T20 wedge bulb rated at 12V and 21W with natural amber glass. Its T20 base differs from the T25 base used by the 4157 and 3157NA, meaning it is not physically interchangeable with those bulbs.
• The rear turn signal specification for the Mazda Tribute changes across nearly every model year from 2001 to 2011, with six distinct bulb types used across ten model years. This reflects a high degree of variation in rear fitment compared to the relative consistency seen at the front.
• The 2356 bulb specified for the 2003 rear turn signal uses a BAY15d bayonet base, which is a fundamentally different mounting type from the wedge-base bulbs used in all other Tribute turn signal positions. A BAY15d base uses two pins offset at different heights to prevent incorrect installation.
• The 2456 bulb, specified for the 2001 and 2004 rear turn signal, is classified as a festoon-type bulb intended for specialty applications. Festoon bulbs make contact at each end of the bulb body rather than through a base, distinguishing them from both wedge and bayonet types used elsewhere in these specifications.
• The 3156 bulb specified for the 2002 rear turn signal is a single-filament T25 wedge bulb rated at 12V and 27W. While it shares the T25 wedge base with the dual-filament 4157 and 3157NA, its single-filament configuration means it is not a direct substitute for those bulbs in positions requiring dual-filament operation.
• Natural amber glass, denoted by the NA suffix on bulbs such as the 3157NA, 3357NA, 3457NA, and 7440NA, produces an amber output through the glass itself rather than through a clear bulb in an amber-tinted housing. This distinction is relevant where regulations or housing design require the amber color to originate at the bulb.
• The T25 and T20 designations on wedge bulbs refer to the width of the wedge base, with T25 indicating a wider base than T20. These two base sizes are not interchangeable, and the socket in the vehicle is designed to accept only the specified base width.