The Mazda Navajo front and rear turn signal bulbs both utilize a 3157 size bulb for proper operation. The replacement chart covers 1991 to 1994 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 Navajo uses the 3157 bulb across all listed model years (1991-1994) for both front and rear turn signals.
The 3157 is an ANSI-standardized bulb type, meaning its specifications are governed by a formal industry standard applicable in the United States and Canada.
The 3157 is a dual-filament bulb, which means it contains two separate filaments within a single housing, allowing it to serve more than one lighting function from a single socket.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles and light trucks of this era.
The two filaments in the 3157 are rated at 27 watts and 7 watts respectively, with the higher-wattage filament typically associated with the turn signal or brake function and the lower-wattage filament associated with a parking or running light function.
The 3157 uses a T25 wedge-style base, a designation that refers to the shape and size of the bulb's base, which determines socket compatibility.
Because the same bulb number applies to both the front and rear turn signal positions across all listed years, a single bulb type services four distinct lighting positions on the vehicle.
The T25 wedge base of the 3157 is not universally interchangeable with other wedge-base bulbs, as differences in base width and pin configuration can affect fitment even when the overall housing shape appears similar.