Freightliner M2 Roof Marker Bulb Size

The Freightliner M2 roof marker bulb uses a 193 size bulb for replacement applications across the specified model line. The replacement chart covers vehicle production spanning from 2002 to 2024.

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
2002-2024	193

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	193

Other Locations

Additional Notes

The Freightliner M2 uses the 193 bulb size for its roof marker lights across the 2002-2024 model years.
The 193 is a miniature wedge bulb built to the T10 form factor, which refers to a tubular bulb body approximately 10 millimeters wide with a wedge-style base that requires no separate socket locking mechanism.
The 193 bulb operates at 12 volts and draws 3.78 watts, placing it in the low-wattage range typical of marker and clearance lighting applications.
The 193 designation follows ANSI standardization recognized in both the United States and Canada, meaning the specification is consistent across North American replacement part sources.
The wedge base design of the 193 bulb is a push-in fitment, where the glass envelope itself acts as the retention element within the socket rather than relying on a bayonet or screw base.