Freightliner 114SD Tail Light Bulb Size

The Freightliner 114SD tail light requires bulb size 1157 for proper operation and visibility on the road. Data for the specified lighting component covers the range from 2012 to 2014.

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
2012-2014	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The 1157 is the tail light bulb type specified for the Freightliner 114SD across the 2012-2014 model years.
The 1157 operates on a 12-volt electrical system, which is the standard voltage for automotive lighting circuits.
As a dual-filament bulb, the 1157 carries two separate wattage ratings: 21W for the higher-intensity filament, typically used for braking or turn signals, and 5W for the lower-intensity filament, used for running or parking light functions.
The 1157 uses a BAY15d bayonet base, a two-pin offset base design that physically prevents incorrect installation of single-filament bulbs in sockets requiring dual-filament function.
The 1157 is an ANSI-standardized type recognized in both the United States and Canada, meaning replacement bulbs sourced from either market share the same electrical and physical specifications.
Because the BAY15d base is offset, it is not interchangeable with the BA15d base, which shares a similar appearance but uses symmetrically placed pins intended for single-filament applications.