Mercury Cougar Map Light Bulb Size

Additional Notes

• The bulb size 105 is the most frequently specified map light bulb across the Mercury Cougar lineup, appearing in model years 1975 and 1980-1997, with the sole exception of 1992 and 1984 within that later span.
• The 105 bulb is a single-filament unit with a BA15s bayonet base, rated at 12V and 13W, and is classified as a variant of the 1156 bulb type under the ANSI standard.
• The 1992 Mercury Cougar departs from the 105 specification, instead using the 168 bulb, a T10 miniature wedge type rated at 12V and 4.9W, which draws considerably less wattage than the 105.
• The 1984 model year specifies the 912 bulb, a T15 wedge type rated at 12V and 12W, noted as a variant of the 921. Its wedge base makes it physically incompatible with the BA15s bayonet socket used by the 105.
• Model years 1977-1979 share the 211-2 festoon bulb, which uses an SV8.5 base with a 41mm length and is rated at 12V and 12W.
• The 212-2 bulb, specified for 1972-1973, shares the same SV8.5 base, 41mm length, and 12V/12W rating as the 211-2, making the two technically identical in their published specifications.
• The 631 bulb, used in 1967-1968, carries a BA15s bayonet base like the 105 and 1003, but is rated at 12V and 21W, classifying it as a variant of the 1156 at a higher wattage output.
• The 1003 bulb, specified for 1974 and 1976, also uses a BA15s bayonet base and is rated at 12V and 21W, placing it in the same base family as the 105 and 631 but at a higher wattage than the 105.
• The 1816 bulb, used in 1969-1971, is a T3.25 miniature wedge type rated at 12V and 4W, the lowest wattage of any bulb specified across the Mercury Cougar map light fitment data.
• Because the Mercury Cougar map light specifications include BA15s bayonet, wedge, and festoon base types across different model years, bulbs from one generation are not interchangeable with those from another without confirming socket compatibility.