Ford Fairmont front and rear side marker bulbs both utilize a 194 bulb size. The replacement chart covers 1978 to 1983 vehicle production 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 Ford Fairmont uses the 194 bulb for both front and rear side marker positions across the full 1978-1983 production run.
The 194 is an ANSI-standardized bulb recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by all compliant manufacturers.
The 194 bulb follows the T10 miniature wedge form factor. A wedge-type bulb has no metal base or pins; instead, the glass envelope itself is pinched at the bottom to form a friction fit within the socket.
The T10 designation refers to the bulb's tubular shape, with the numeric portion indicating a width of 10 eighths of an inch across the widest point of the glass envelope.
The 194 operates at 12 volts and draws 3.78 watts, placing it in the low-wattage category typical of marker and courtesy lighting applications rather than primary illumination.
Because the Ford Fairmont (1978-1983) uses the same 194 bulb in all four side marker positions, a single bulb type services the entire side marker system on the vehicle.
The wedge base of the 194 is not interchangeable with bayonet-base or screw-base miniature bulbs, even when those alternatives share a similar wattage or voltage rating.