The Isuzu Stylus front and rear side marker bulbs both require a 194 bulb size. The replacement chart covers 1991 to 1993 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 194 bulb is the sole bulb type listed across all side marker positions on the Isuzu Stylus, covering model years 1991-1993.
The 194 is classified as a miniature wedge bulb, designated T10 in the international bulb nomenclature system. The T10 designation refers to the tubular glass envelope width, expressed in eighths of an inch.
The 194 operates at 12 volts with a power draw of 3.78 watts, placing it in the low-wattage range typical of marker and courtesy lighting applications.
The wedge base design of the 194 relies on the glass envelope itself to make electrical contact within the socket, with no separate metal base or pins involved.
The 194 carries ANSI standardization applicable to both the United States and Canada, meaning the bulb conforms to a shared North American specification rather than a manufacturer-specific one.
Because the front and rear side marker positions on the Isuzu Stylus share the same 194 bulb size across all listed years, the bulbs are physically interchangeable between those positions.
The T10 wedge form factor is shared by several bulb numbers beyond the 194, including the 168 and 192. Those alternatives differ in wattage and are not direct equivalents, so substitution affects the electrical load at the socket.