Hi Rob! Welcome to Ninjette!
Your wiring is correct, don’t waste any time on that.
Sounds like starter-clutch is not gripping. Need to take out and verify three spring-loaded roller-bearing pawls are seated correctly.
This functions similar to freewheel on rear wheel of bicycle. It’s disengages when spun by engine on inside in one direction. But grips and turns engine when spun from outside edge by starter.