In the 2008 Lancer GTS there is a Gromet (round rubber incert) in the firewall that you can push through and you can run right into the car through the firewall to directly behind the glovebox. Open the hood and look to the far left (passenger side). Use a flashlight and you will clearly see down in the corner a 2 cm black round gromet. Run your power where the green line is to the area by the circle where below the circle you will find the hole through the firewall. There is some fabric you will have to cut through on the interior side. comes right through into the glovebox. There is nothing in the way where it enters the glovebox.
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