Dodge Dart Back Up Light Bulb Size

Additional Notes

• The Dodge Dart backup light specifications cover two distinct production eras: a classic generation spanning 1960-1971 and a modern generation spanning 2013-2016.
• The 7440 is a T20 wedge-base bulb operating at 12V and 21W. It uses a push-in wedge fitting rather than a bayonet base, which makes it physically incompatible with sockets designed for the 1156, 1141, or 1073 bulbs used in earlier Dart models.
• The 2013-2016 Dodge Dart uses the 7440 bulb across all four model years of that generation.
• The 1156, 1141, and 1073 bulbs all share the BA15s single-contact bayonet base, meaning the socket type is consistent across the 1960-1971 Dart generation despite the different bulb numbers.
• The 1156 is the most frequently specified bulb across the classic Dart lineup, appearing in the 1960-1965 and 1968-1971 model years.
• The 1156 and 1141 both operate at 12V and 21W with a BA15s bayonet base. The distinction between them lies in their internal construction and light output characteristics rather than voltage or wattage, which means they are not confirmed interchangeable despite their similarities.
• The 1073 bulb, specified for the 1964 Dart, operates at 12V and 13W, making it a lower-output variant compared to the 21W rating shared by the 1156 and 1141. Substituting a higher-wattage bulb in a socket rated for the 1073 carries a risk of exceeding the designed electrical load for that circuit.
• The 1967-1966 Dart models use the 1141 rather than the 1156 found in adjacent model years, indicating a socket or specification change specific to those two years that affects direct bulb substitution decisions.