Freightliner FS65 Back Up Light Bulb Size

The Freightliner FS65 back up light requires a bulb size of 1159 for the specific lighting assembly. Data for the required component 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 Type	Shop
1996-1997	1159 (Cab Over Engine)	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V.	1159	Check Price

Other Locations

Additional Notes

The 1159 bulb is the specified backup light bulb size for the Freightliner FS65 (Cab Over Engine) across the 1996-1997 model years.
The 1159 follows the ANSI standard, meaning its specifications are governed by a recognized North American standardization body, ensuring consistent production across manufacturers in the US and Canada.
Despite its designation as a dual-filament bulb, the 1159 uses only one filament in backup light applications, as backup lights are single-function circuits.
The 1159 uses a BAY15d bayonet base, a two-pin offset base type where the two pins are positioned at different heights to prevent incorrect installation orientation.
The 1159 operates at 12 volts, consistent with the standard electrical system voltage found in most commercial vehicles of this type.
The Cab Over Engine body configuration is a noted fitment qualifier for the FS65, meaning this specification applies specifically to that body style and substitutions should account for this distinction.