Mercury Marquis Back Up Light Bulb Size

Additional Notes

• The Mercury Marquis backup light bulb specifications cover model years 1967-1986, with three distinct bulb types appearing across that span: the 1156, 1076, and 1141.
• The 1156 is the most frequently specified bulb across the Mercury Marquis lineup, covering model years 1968-1972 and 1974-1986.
• The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, a single-contact base design that locks into the socket with a twist.
• The 1141 is specified for the 1967 Mercury Marquis and shares the same 12V, 21W rating and BA15s bayonet base as the 1156, though the two carry different ANSI designations and are not confirmed interchangeable by these specifications.
• The 1076 is specified exclusively for the 1973 Mercury Marquis and is described as a variant of the 1156, but it is rated at a significantly lower 8W output while operating at the same 12V.
• Because the 1076 draws considerably less wattage than the 1156, substituting one for the other in the 1973 model year would result in a meaningful difference in light output.
• All three bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating a standardized North American fitment classification.
• The shared BA15s bayonet base across all three bulb types means the physical socket interface is consistent throughout the entire 1967-1986 Mercury Marquis range, even where wattage or ANSI designation differs.