Rats nests/wiring problems

[1970CamperRanger]

Thank you all for the advice and tips, I hope to get back to work on the wiring after finals next week, wish me luck in both. The electrical problems just seem so immense, the only thing working on that truck electrical wise is everything related to turning 'er over, headlights and windshield wipers, so I'm going to get to play under that truck for a while, I've been using wiring diagrams to tag the wires with masking tape and a pen, the idea I was playing with was to find the wire coming directly off the brake light switch, and the turn signal switch and run a new wire for both, then start tearing things apart once I got those working.