Think of it as off earths out the coil wire to ground (negative)
In the on or run position the starter key switch doesn't need to touch any wires together in this position.The on /run is the same.
The start position just energizers the starter solenoid so battery positive to the starter solenoid .
The 3 key positions are OFF/ (ON RUN) /START
If you are using a motorbike ignition switch it may not work as you need a switch that when it's in the off position it has 2 different connectors that complete a circuit and they don't all work like that.
The charging coil is connected to positive no mater what position the switch is in .
