Work it through in stages. You have:
Thick Brown with white stripe, this is the feed FROM the maxi fuse, check you have 12V here first.
Thick White, this is the switched ignition wiring etc. If you touch that to the brown stripey you should get the stack turning on and indicators/horn should work.
Thick Yellow, this is start drop out (i.e. stops working as you crank). Touch this to brown stripey and you should get wipers/heater fan working.
The little thin black one is the crank wire… touch it to brown stripey and the starter should spin.