Mazda B1600 Turn Signal Bulb Size

The Mazda B1600 front and rear turn signal bulbs both utilize a 1157 bulb size. The replacement chart covers vehicle production spanning 1975 to 1976.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

Years	Bulb Size
1975-1976	1157

Rear Turn Signal

Years	Bulb Size
1975-1976	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The Mazda B1600 uses the 1157 bulb across both its front and rear turn signal positions for the 1975-1976 model years.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve two distinct lighting functions at different wattages.
The 1157 operates on a 12-volt electrical system and draws 21 watts on its high-intensity filament and 5 watts on its low-intensity filament.
The 1157 uses a BAY15d bayonet base, which features two offset pins at different heights to ensure correct orientation during installation and prevent incorrect filament activation.
The 1157 conforms to ANSI standards and is recognized across both the United States and Canada, placing it within a widely distributed North American specification framework.
The uniform use of the 1157 across all four turn signal positions on the B1600 means the front and rear positions share the same bulb type, with no variation between locations.