Fiat 124 front and rear side marker bulbs both utilize a 194 size bulb for proper illumination. The replacement chart covers vehicle production spanning 1976 to 1983 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Fiat 124 uses the 194 bulb for both the front and rear side markers across the 1976-1983 model years.
The 194 is a miniature wedge-type bulb, classified under the T10 form factor, which refers to its tubular shape with a wedge base that requires no separate 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 side marker and courtesy lighting applications.
The 194 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared across manufacturers.
Because the same 194 bulb size is specified for both the front and rear side marker positions on the Fiat 124, a single bulb type serves all four side marker locations on the vehicle.
The T10 wedge base design of the 194 bulb is not compatible with bayonet or screw-base sockets, and substitution with bulbs of differing base types would require a different socket or adapter.
The uniformity of the 194 specification across all listed model years of the Fiat 124 indicates no bulb size change occurred in the side marker positions throughout the 1976-1983 production run.