Mercury Monterey front and rear side marker bulbs utilize 194, 97, 161, and 916 bulb sizes across different positions and model generations. The replacement chart covers 1969 through 2007 production years with corresponding bulb size specifications for each vehicle generation.
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 most frequently specified size across the Mercury Monterey's side marker positions, appearing in both front and rear applications across multiple model years.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, conforming to ANSI standards for the US and Canadian markets.
The 916 bulb, specified for the rear side marker on the 2006-2007 Mercury Monterey, is a T15 wedge type rated at 12V and 18W, making it notably higher in wattage than the T10 194 used in earlier model years.
The T15 and T10 designations indicate different physical sizes, meaning the 916 and 194 are not interchangeable despite both using a wedge base configuration.
The 97 bulb, used in the 1971-1972 front and rear side marker positions respectively, uses a BA15s single-contact bayonet base and is rated at 12V and 13W, classifying it as a variant of the 1156 bulb family.
Because the 97 uses a bayonet base rather than a wedge base, it is physically incompatible with sockets designed for the 194 or 161, even though all three appear within the same vehicle's specification history.
The 161 is also a T10 miniature wedge bulb, sharing the same base type as the 194, but it is rated at only 1W compared to the 194's 3.78W, which reflects a lower output intended for specific lighting functions.
The 1034NA, specified for the 1969 front side marker, is a dual-filament bulb with a BAY15d bayonet base and natural amber glass, rated at 12V with a 21/5W dual-wattage output, classifying it as a variant of the 1157 family.
The BAY15d base of the 1034NA features offset pins to prevent incorrect installation, distinguishing it from the single-filament BA15s base used by the 97 bulb, and making the two non-interchangeable.
The natural amber glass of the 1034NA produces a colored output directly from the bulb itself, rather than relying on a tinted lens to achieve the amber appearance required for side marker functions.