Dodge Colt Back Up Light Bulb Size

The Dodge Colt back up light uses 1156 and P21W bulb sizes depending on the specific version of the vehicle. Available data covers the range from 1971 through 1994.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1992-1994	1156
1979-1985	1156
1971-1974	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Dodge Colt backup light uses the 1156 bulb across all model years listed in the specifications, spanning 1971-1974, 1979-1985, and 1992-1994.
The 1156 is an ANSI-standardized bulb, meaning its physical and electrical specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is consistent with standard incandescent automotive backup light applications.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, as opposed to dual-filament bulbs that handle two functions such as braking and running light from a single housing.
The 1156 uses a BA15s bayonet base, where "BA15" refers to a 15mm base width and the "s" denotes a single-contact configuration, corresponding to its single-filament design.
The BA15s bayonet mount is a twist-and-lock style base, secured by two pins on the side of the bulb that seat into corresponding slots in the socket.
Because the 1156 has a single contact at its base, it is not interchangeable with the 1157, which shares the same BA15 base width but features two contacts for dual-filament operation. Substituting one for the other in a given socket is not supported by these specifications.