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How to turn on your added light in Euro Truck Simulator

You are need to turn on your added light manually,
the steps are:
load your game, click ''Cabin Adjustments'' under your nickname,
click "Adjust Lights", and tick two choice boxes which have not been selected.

Pay attention: the setting of "Adjust Lights" will disappear after you go to the garage, so just remember to do this again after that.

About 18 Wos
18 Wheels of Steel (sometimes abbreviated as 18 WoS) is a 3D animated series of trucking simulators published by ValuSoft and developed by SCS Software from 2003 to 2011. The series currently has 7 installments.
Much of the game's data is in a file named "base.scs". This file can be extracted with most zip compression software. Within the new folders are most of the game textures, including terrain, truck skins, backgrounds, and others, as well as code for cities, trucks, and other in-game objects. While the game's publisher, ValuSoft, does not provide support on exactly how to "mod" the game, there are several communities and sites dedicated to that purpose, creating even new maps and trucks.