Help! Wiring has been modified

[RealJeep]

Someone has replaced the ignition switch with one that only has three terminals so the diagram is not correct.
This tractor does not have the PTO so the switch is not needed.
It will crank but no voltage is showing up on Coil + when the key is on.

Question: Are the A and I terminals on Ign Switch both hot when key is on?

 

[RealJeep]

What the wiring diagram doesn't show is a wire running from the coil + terminal to the points.
Do I need to run a hot wire to the positive side of the coil?
Where does the wire from the negative side of the coil go? That's not in the diagram either.

 

[dschwandt]

The diagram is correct, what's not correct is the switch.
Get the correct switch IH-61524-C2

That's the connector from the engine harness to the dash harness.
The minus wire on the coil terminal goes to the points and the condenser