Dodge Coronet Back Up Light Bulb Size

Additional Notes

• The Dodge Coronet back up light specifications span model years 1953 through 1976, drawing from four distinct ANSI-standard bulb types: 1156, 1141, 1073, and 1129.
• The 1156 is the most frequently specified bulb across the Coronet's back up light fitments, appearing in model years 1959-1965, 1969-1971, and 1973-1976.
• The 1156 is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and is an ANSI-standard type used in both the United States and Canada.
• The 1141 shares the same BA15s bayonet base, 12V operating voltage, and 21W rating as the 1156, making both bulbs electrically similar single-filament types within the same base family.
• Despite their electrical similarities, the 1156 and 1141 are distinct ANSI part numbers, and substitution between them warrants caution as fitment compatibility depends on the specific socket and housing of each model year.
• The Dodge Coronet (1966-1968 and 1972) uses the 1141 bulb for the back up light position, representing the years within the specification range where this type was factory-designated.
• The 1073 bulb, specified for the 1956-1957 Coronet, is a single-filament BA15s type rated at 12V and 13W, making it a lower-wattage variant of the 1156 and not a direct electrical equivalent.
• The 1129 bulb, specified for the 1953-1955 Coronet, is a dual-filament type with a BAY15d bayonet base rated at 12V and 21/5W, and is described as a variant of the 1157.
• The BAY15d base of the 1129 is physically distinct from the BA15s base used by the 1156, 1141, and 1073 bulbs, meaning these types are not interchangeable due to differing base configurations.
• The dual-filament construction of the 1129 differs fundamentally from the single-filament design of all other bulb types in these specifications, reflecting a different circuit and socket arrangement in the earliest Coronet model years covered.