Isuzu Impulse front and rear side marker bulbs use a 194 bulb size for replacement applications. The replacement chart covers vehicle production spanning 1983 to 1992.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Isuzu Impulse uses the 194 bulb for both front and rear side markers across the 1983-1992 model years.
The 194 is classified as a miniature wedge bulb, corresponding to the T10 form factor, which refers to a tubular bulb body roughly 10mm wide with a wedge-style base that requires no socket pins.
The 194 bulb 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 194 follows the ANSI standard, meaning it conforms to specifications recognized across the United States and Canada, which governs its electrical and physical characteristics.
Because the same bulb size is specified for both the front and rear side marker positions on the Isuzu Impulse, a single bulb type serves all four side marker sockets on the vehicle.
The wedge base design of the 194 bulb is retained by friction within the socket rather than by a bayonet or screw mechanism, which is a relevant fitment consideration when sourcing replacements.
The T10 wedge format of the 194 is shared with several other bulb numbers in the miniature wedge family, though wattage and voltage ratings differ between them, making direct substitution inadvisable without confirming electrical compatibility.