Mitsubishi Fuso FH Back Up Light Bulb Size

The Mitsubishi Fuso FH back up light utilizes 1156 and P21W bulb sizes for the lighting components. Available information covers the specific time period from 1988 through 1998.

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
1988-1998	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 Fuso FH uses the 1156 bulb for its back up light across the 1988-1998 model years.
The 1156 is an ANSI-standardized bulb type recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical parameters shared by compliant manufacturers.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is consistent with standard automotive reverse lighting applications.
The bulb uses a BA15s bayonet base, a single-contact fitting where the "s" designation indicates a single center pin at the base, distinguishing it from dual-contact bayonet variants.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which in this application is the reverse light.
The BA15s bayonet mount is not interchangeable with the BA15d base, which carries two offset pins. Substituting a dual-contact bulb in a single-contact socket is not compatible.
The 1156 is also commonly designated as P21W in European markets. While the electrical ratings are equivalent, fitment should be confirmed against the BA15s base specification before substitution.