The Freightliner XB Line front and rear turn signal bulbs both utilize a 198 size bulb for proper operation. The replacement chart covers vehicle production spanning 1995 to 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 198 bulb is the sole bulb type specified for the Freightliner XB Line across all listed turn signal positions and model years, covering both front and rear turn signal applications for 1995-1997.
The 198 bulb follows the ANSI standard recognized in both the United States and Canada, meaning it conforms to a standardized specification governing its electrical and physical characteristics.
It is classified as a miniature wedge bulb in the T5 form factor. The T5 designation refers to a tubular bulb with a width of 5/8 of an inch, and the wedge base type means the bulb is held in its socket by the glass envelope itself rather than by a separate metal base with pins.
The 198 bulb operates at 12 volts and draws 2 watts, placing it at the low end of the power consumption range for automotive signal bulbs. This wattage is consistent with indicator-level lighting rather than high-output signaling.
Because the same bulb number applies to both the front and rear turn signal positions on the Freightliner XB Line, a single bulb type serves all four turn signal sockets on the vehicle across the 1995-1997 model years.