Freightliner Cascadia Dome Light Bulb Size

The Freightliner Cascadia dome light utilizes 5008 and 232 bulb sizes according to the provided specifications for the interior lighting components. Data for the lighting requirements spans the period from 2008 through 2017.

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
2016-2017	5008
2015	232
2010-2014	5008
2008-2009	232

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V.	5008
ANSI standard (US & Canada). Festoon bulb with SV8.5 base. 12V, 3W.	232

Other Locations

Additional Notes

The Freightliner Cascadia dome light uses two distinct bulb types across the 2008-2017 model range: the 5008 and the 232, both of which are ANSI-standardized bulbs rated for 12V electrical systems.
The 5008 bulb is the more frequently specified of the two, appearing in the Cascadia for 2010-2014, 2016, and 2017.
The 5008 is a single-filament bulb with a BA15s bayonet base, functioning as a lower wattage variant of the widely known 1156 bulb type.
The 232 bulb is a festoon-style bulb with an SV8.5 base, rated at 12V and 3W, and is specified for the 2008, 2009, and 2015 model years.
Festoon bulbs such as the 232 are cylindrical in form and mount by pressing between two spring contacts at each end, a mounting method entirely different from the BA15s bayonet base used by the 5008.
The BA15s bayonet base of the 5008 and the SV8.5 festoon base of the 232 are physically incompatible with each other, meaning the two bulb types are not interchangeable regardless of voltage rating.
The 2015 model year specifies the 232, while the surrounding years of 2014 and 2016 specify the 5008, indicating that the socket type in the dome light housing is not uniform across all production years.