I have a 2008 GMC Duramax crew cab with a 275 amp alternator that I gutted the interior, top to bottom, & put 100mil Kilmat and Dynopad in. I’ve ran a 1:0 power line, 18ga 9 speedwire conductor from the in dash Sony XAV-601BT, and 12ga leads going to all 4 doors. The last time I did a real...