Chrysler Town & Country Back Up Light Bulb Size

Additional Notes

• The back up light bulb for the Chrysler Town & Country follows the ANSI standard across all listed model years, meaning all bulb sizes referenced in these specifications are standardized for the US and Canadian markets.
• The 3157 is the most frequently specified bulb across the listed model years, covering the 2008-2016 range. It is a dual-filament T25 wedge bulb rated at 12V with a 27W/7W output.
• The 3057 shares the same T25 wedge form factor and 12V, 27W/7W rating as the 3157, though the two are distinct part numbers. Both are dual-filament bulbs, and their physical and electrical similarities can create confusion during replacement. The 3057 is specified for the 1996-2004 model years.
• The 1156 is the most widely recurring bulb across the older model years in these specifications, appearing across much of the 1958-1990 range. It uses a BA15s single-contact bayonet base and is rated at 12V, 21W.
• The 1141, specified only for the 1977 model year, shares the same BA15s bayonet base and 12V, 21W rating as the 1156. Despite their identical electrical ratings, they carry different ANSI designations and are not guaranteed to be interchangeable without verification.
• The 1073, specified across several model years between 1956 and 1968, also uses a BA15s bayonet base but operates at a lower wattage of 13W compared to the 1156's 21W. Substituting one for the other would result in a difference in light output.
• The 921 is a single-filament T15 wedge bulb rated at 12V, 16W, specified for the 1991-1995 model years. Its wedge base design differs from the bayonet-base bulbs used in earlier model years, making it physically incompatible with those sockets.
• The 1129, specified for the 1951-1955 model years, is a dual-filament bulb using a BAY15d bayonet base. The BAY15d base is a two-contact bayonet fitting, which is physically distinct from the single-contact BA15s base used by the 1156, 1141, and 1073 bulbs.
• The shift from bayonet-base bulbs in earlier model years to wedge-base bulbs in later ones reflects a broader industry transition in bulb socket design. Wedge-base bulbs such as the 921, 3057, and 3157 are not physically compatible with the bayonet sockets used for bulbs like the 1156 or 1129.
• The 1129 is noted as a variant of the 1157 and carries a 21W/5W dual-filament rating. Its BAY15d base is shared with the 1157 family, though wattage differences between variants mean they are not always interchangeable in practice.