Freightliner FS65 Courtesy Bulb Size

The Freightliner FS65 courtesy light requires a bulb size of 105 for the specific lighting application. Data for the bulb requirements covers the range from 1996 through 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	105 (Cab Over Engine)	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	105	Check Price

Other Locations

Additional Notes

The bulb type 105 is an ANSI-standard single-filament bulb rated at 12 volts and 13 watts, fitted with a BA15s bayonet base. It is a variant of the widely recognized 1156 bulb family, sharing the same base configuration while differing in wattage output.
The Freightliner FS65 (Cab Over Engine) uses the 105 bulb for courtesy lighting across the 1996-1997 model years.
The BA15s designation indicates a single-contact bayonet base with a 15mm collar width, which is not interchangeable with the BA15d double-contact base used in other automotive applications. Substituting a double-contact base bulb into a single-contact socket results in an improper fit.
Although the 105 is a variant of the 1156, the two bulbs carry different wattage ratings and are not direct replacements for one another in all applications. The 1156 is typically rated at 26.9 watts, making it a significantly higher-output bulb than the 13-watt 105.