check battery, check ignition fuse, check neutral switch, pull and check starter relay, then check power at ignition not too complicated he just didn’t show it very well
Seems pretty straightforward to me. Worked on about 5 jap shitboxes in 40 years of working on cars. This is a great tutorial on where the circuits and relays are. If you've never worked on a certain make before, this is a great help.