Mercury Grand Marquis License Plate Bulb Size

Additional Notes

• The Mercury Grand Marquis license plate position uses two bulb sizes across its model years: the 168 and the 194, both of which are ANSI-standardized miniature wedge bulbs classified under the T10 form factor and rated for 12-volt automotive electrical systems.
• Although the 168 and 194 share the same T10 wedge form factor and 12-volt rating, they are not electrically identical. The 168 draws 4.9 watts while the 194 draws 3.78 watts, meaning the two types differ in power consumption and are not interchangeable without accounting for that difference.
• The 168 bulb is the more widely specified of the two across the Grand Marquis model range, appearing in the majority of model years covered by these specifications.
• The Mercury Grand Marquis (1996-2011) uses the 168 bulb exclusively for the license plate position throughout that sixteen-year span.
• Model years 1991-1995 are specified with the 194 bulb, representing a five-year period during which the lower-wattage type was fitted at the factory.
• The 1980-1990 model years return to the 168 specification, with the single exception of 1979, which is listed with the 194.
• The years 1975-1976 and 1978-1979 carry the 194 specification, while 1977 is listed with the 168, indicating that bulb selection was not uniform across consecutive years during that period.
• The T10 wedge base is a tool-free, push-in fitting, which is a physical characteristic shared by both the 168 and 194 types used in this application.