Wiring problems before inspection

[71C10Guy]

So about a week ago my blinkers, wipers, blower motor, reverse lights, and brake lights all went out at once. I have no explanation for it, but now my alternator only seems to kick on after I use my blinker, which also makes my brake lights go off on whatever side I turned my blinker to. Is there a central fuse for accessories behind the main panel or something? Or any kind of explanation of this all happening at once after a year and a half of the truck being back on the road?
Btw the previous owner had all kinds of aftermarket electronic stuff on the truck that my dad and I ripped out without discretion, so the entire truck is basically just a giant ball of ubconnected and stripped wires. Also what's left of the original wiring harness is spliced into so many times it might as well be a tree. There are splices on top of splices on top of splices on some of the wires. I know this will just take time to sort out or a new wiring harness. My question is possible reasons for multiple systems going out all at once?