Freightliner FL50 Roof Marker Bulb Size

The Freightliner FL50 roof marker utilizes a 194 bulb size for illumination across all listed vehicle applications. Data for the specified component covers the period from 1995 through 2005.

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
1995-2005	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

Other Locations

Additional Notes

The Freightliner FL50 uses the 194 bulb for its roof marker position across the 1995-2005 model years.
The 194 is a miniature wedge-base bulb in the T10 form factor, which refers to a tubular glass envelope approximately 10 eighths of an inch wide.
The wedge base design means the bulb is held in place by the socket gripping the glass base directly, with no separate metal base or pins involved.
The 194 operates at 12 volts and draws 3.78 watts, placing it in the low-wattage range typical of marker and clearance lighting applications.
The 194 carries ANSI standardization recognized in both the United States and Canada, meaning the specification is consistent across North American replacement parts.
Because the 194 is an ANSI-standardized type, physically compatible substitutes such as the 168 or 2825 exist, though those alternatives carry different wattage ratings and may not meet original equipment output levels.