The Isuzu Pickup brake light utilizes 1157 and 1034 bulb sizes depending on the specific production period for the vehicle. Information provided covers the range from 1981 to 1995.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Isuzu Pickup uses the 1157 bulb as its brake light across the 1984-1995 model years, making it the most widely specified bulb type in these brake light specifications.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V and 21W/5W, where the higher wattage filament serves the brake function and the lower wattage filament serves a secondary function such as running lights.
The 1981-1983 Isuzu Pickup brake light uses the 1034 bulb instead of the 1157, representing a distinct fitment for those earlier model years.
The 1034 is also a dual-filament BAY15d bulb rated at 12V and 21/5W, and is classified as a variant of the 1157 under the ANSI standard. Despite their similar electrical ratings, the two bulbs are not confirmed as interchangeable in these specifications and should be treated as separate part numbers.
Both the 1157 and 1034 share the BAY15d bayonet base, a two-pin offset base design that physically prevents single-filament bulbs from being installed in its place.
The Center High Mount Stop Light on the Isuzu Pickup uses the 168 bulb for the 1988-1995 model years.
The 168 is a miniature wedge bulb in the T10 form factor, rated at 12V and 4.9W. As a single-filament wedge type, it is electrically and physically incompatible with the BAY15d dual-filament bulbs used in the standard brake light positions.
All three bulb types specified, the 1157, 1034, and 168, conform to ANSI standards applicable in both the United States and Canada.