Mazda B3000 front turn signal bulbs use 3157NA or 3157 size, while rear turn signal bulbs use 2456, 2356, or 3156 size. The replacement chart covers 1994 through 2007 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mazda B3000 front turn signal uses the 3157NA bulb for model years 2000-2007. This is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and 7W low filament, and its natural amber glass produces a yellow-orange signal color without relying on a colored lens or housing.
The 3157 bulb covers the Mazda B3000 front turn signal for model years 1994-1999 (excluding 1997). It shares the same T25 wedge base, 12V operating voltage, and 27W/7W dual-filament configuration as the 3157NA, but its glass envelope is clear rather than amber-tinted.
Because the 3157 and 3157NA share the same base type and electrical ratings, they are physically interchangeable in the front turn signal socket. However, substituting a clear 3157 where a 3157NA is specified may alter the output color if the housing does not provide its own amber filtering.
The rear turn signal position across the B3000 model range draws from three distinct bulb types: the 2356, 2456, and 3156. These are not interchangeable with one another, as they differ in base design, filament count, and wattage.
The 3156 is a single-filament T25 wedge bulb rated at 12V and 27W. It is used in the rear turn signal of the B3000 for model years 1995, 1998, 2000, and 2001. Its single-filament design means it serves a dedicated signaling function rather than a combined stop-and-signal role.
The 2356 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V. It appears in the rear turn signal for model years 1994, 2002-2003, 2005-2006. The BAY15d base is an offset-pin bayonet mount, which prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The 2456 is a festoon-style bulb rated at 12V and is designated for specialty applications. It is used in the rear turn signal for model years 1996, 1999, 2004, and 2007. Festoon bulbs are held in place by contact pressure at each end rather than by a base socket, which is a physically distinct mounting method from the wedge or bayonet types used elsewhere in this application.
The rear turn signal bulb specification for the B3000 changes across multiple model years, with no single bulb type used consistently throughout the entire production run. Installers referencing the wrong year may select an incompatible base type.
All five bulb types listed in these specifications conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and dimensional tolerances within each respective bulb family.
The front turn signal position shows considerably more consistency than the rear, with the same bulb family (3157 or 3157NA) used across all listed model years from 1994 through 2007.