Merged 2 of your threads, and deleted the 3rd.
First of all what motor, assuming Merc
Trace the 12V starter post to key
Starter post to 90 amp fuse (its on the post)
90 amp to 50 amp breaker
50 amp breaker to engine connector pin 6 red/purple
Pin 6 to ignition fuse/breaker (either behind helm...