Electrical problems peterbilt 386

Hello, on my 2007 peterbilt 386 I had several things quit working The other morning at 1 time. My blower fan quit my window controls and power mirror on my driver's side Door and my aux lights.(lights along bottom of cab and sleeper). The other switches that are directly right of my steering wheel, such as cruise, engine fan And so on all work, but they do not light up. My check engine light also came on at the same time which seems odd.
I've cleaned up battery connections The low voltage disconnect and i've checked all the fuses and relays in the fuse box by the driver's side door. Any ideas of where to look to next? TIA

 

Update. I found 2 rows of fuses that dont have power to them. Followed the power wire from said rows and there's 5 wires that are spliced in a heat shrink down to one main power wire. I can follow it up behind the steering column by the firewall but can't tell where it goes after that. Anyone able to tell me where the power wires from the fuse panel come from?