No gauge lights or tail light part 2

Previous post no gauge lights 77 kz1000. I gave up
Different bike. 1976 kz900. I haven't touched a wire on this bike. No gauge lights or tail light. rear brake light only works with front brake lever. No power going into brown wire going into rear brake switch off the pedal.
Everything else works headlight blinkers hazards idiot lights
Any electrical gods in NW Indiana swing by and fix I'll pay ya good