Freightliner FS65 Tail Light Bulb Size

The Freightliner FS65 tail light requires a bulb size of 198 for the rear lighting assembly. Data for the specified vehicle covers the range from 1996 to 1997.

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
1996-1997	198 (Cab Over Engine)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W.	198

Other Locations

Additional Notes

The 198 bulb is the tail light bulb size for the Freightliner FS65 (Cab Over Engine) across the 1996-1997 model years.
The 198 bulb follows the ANSI standard, meaning it meets the specifications recognized across the United States and Canada for automotive lighting applications.
This bulb uses a miniature wedge base, which is a baseless design where the glass envelope itself is pinched and inserted directly into a socket, eliminating the need for a separate metal base.
The T5 designation refers to the bulb's tubular shape with a width of 5/8 of an inch, making it among the smaller bulb forms used in automotive applications.
The 198 bulb operates at 12 volts, consistent with the standard electrical system voltage found in most commercial vehicles.
At 2 watts, the 198 bulb draws very little power, a characteristic typical of indicator and auxiliary lighting rather than primary illumination functions.