Mitsubishi Tredia Back Up Light Bulb Size

The Mitsubishi Tredia back up light utilizes 1156 and P21W bulb sizes according to the provided specifications for the lighting components. Available data covers the range from 1983 through 1988.

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
1983-1988	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 Mitsubishi Tredia uses the 1156 bulb across all listed model years for the back up light position.
The 1156 specification applies to the 1983-1988 model years without variation.
The 1156 is an ANSI-standardized bulb, meaning its physical and electrical characteristics conform to a defined North American specification used in the United States and Canada.
The bulb operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent reverse light applications.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, as opposed to dual-filament types that handle two functions such as braking and running light simultaneously.
The BA15s bayonet base features a single locating pin on the side of the base, which distinguishes it from the BA15d base that carries two offset pins. Substituting a BA15d bulb in a BA15s socket is not compatible due to the pin configuration difference.