Ensure you have the .scs file for version 1.4. You can find official versions on the Steam Workshop.
Adds selectable interior lighting colors for truck cabins. ROOM LIGHT PACK V1.4 1.46
If you are running ETS2 1.47 or higher, this 1.46 version may cause crashes or lighting glitches unless updated. Ensure you have the
💡 If the lights aren't showing up, check that you have the Cabin Accessories DLC installed, as many interior lighting mods rely on its attachment nodes. 46 version or help troubleshoot a specific error? Room Light Pack - Steam Workshop ROOM LIGHT PACK V1.4 1.46