i'm tired of going to the dealer and getting nothing fixed! and when they do "fix" something they only half fix the problem! the truck is a 2003 freightliner columbia 12.7 Detroit 10 speed with sleeper. my problem is, i have no interior lights! no over head lights. none of the 4 in cab 12v outlets work. i did notice the fuse box behind the drivers door had a little fire. i originally thought that was the problem. fuse box was replaced and still nothing works. today i went out with a test light, (i need to buy a multimeter) i have no power to the cigarette lighter fuse on either or the 2 fuse boxes. no power on the dash nor the one behind the door.. where do i check next?