Mercury Comet front and rear side marker bulbs utilize a 194 size bulb across both locations. The replacement chart covers 1975 to 1977 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 194 bulb is the sole bulb type listed across all side marker positions for the Mercury Comet, covering model years 1975-1977.
The 194 bulb follows the ANSI standard recognized in both the United States and Canada, meaning it conforms to a standardized set of electrical and physical specifications shared across North American markets.
It operates at 12 volts, which aligns with the standard electrical system voltage found in conventional passenger vehicles of that era.
The rated wattage of 3.78W places the 194 in the low-power category, consistent with its role as a marker lamp rather than a primary illumination source.
The T10 designation refers to the bulb's tubular envelope, with the number indicating a width of 10 eighths of an inch, a common sizing convention in miniature automotive bulb classification.
The wedge base design of the 194 means the bulb is held in its socket by the tension of the base itself rather than by a separate bayonet or screw mechanism, a construction type widely used in side marker and interior lighting applications.
The 194 bulb is shared between the front and rear side marker positions on the Mercury Comet across all three listed model years, indicating socket and electrical compatibility between both locations on the vehicle.
Because the same bulb number applies to both the front and rear side marker sockets, a single bulb type serves all four side marker positions on the vehicle.