The Isuzu Amigo brake light requires a 1157 bulb size for proper installation and function. Available data for the specified vehicle covers the range from 1989 to 2000.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 is a dual-filament bulb operating at 12 volts with a 21W/5W output, mounted on a BAY15d bayonet base. The dual-filament design allows a single bulb to serve both brake and running light functions at different wattages.
The Isuzu Amigo uses the 1157 bulb for brake lights across all listed model years from 1989-2000, with the exception of a gap in the 1995-1997 entries, which are not present in the specifications.
The 921 is a single-filament wedge-style bulb in a T15 form factor, rated at 12 volts and 16 watts. Unlike the 1157, it uses a wedge base rather than a bayonet mount, making the two bulb types physically incompatible with each other.
The Isuzu Amigo Center High Mount Stop Light for 1998-2000 takes the 921 bulb. This application is distinct from the standard brake light position, which uses the 1157 across all listed years.
Both the 1157 and 921 conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical specifications recognized across those markets.
The BAY15d base of the 1157 features two offset pins at different heights, a design that prevents incorrect insertion by ensuring the bulb can only be seated in one orientation.
Because the 1157 uses a bayonet base and the 921 uses a wedge base, these two bulb types are not interchangeable, even though both appear in brake-related applications on the same vehicle.