Engine won’t stop

Your Right Mag switch is NOT connected to the engine ignition coil.

If the Switch OR the Wiring fails, the engine will keep running.

The switch could be bad.

The wires on the switch may have become disconnected or corroded.

The connector on the engine ignition Coil may have become disconnected or corroded.

The wires from the switch to the Ignition Coil may be severed.

The simple explanation of how the MAG Switch works it that it Shorts Out the Points to kill the ignition.

If the switch does not have continuity to the Points, it can't short them out and the engine keeps running.

These are the only switches on the panel that are mounted upside down.

Switch DOWN = Switch ON = Ignition OFF.

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Removing a MAG Switch will definitely keep the engine running.

You needed to short the wires together to kill the ignition.

Thanks for the explanation.  I disconnected the wires from the mag switch and touched them together.  The engine kept running.  After that didn’t work, I cut the fuel off and the engine died.

That probably means the problem is at the engine end of the wiring.

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You initially said you "Disconnected the Fuel Line". 

Do you have a fuel Shut-Off Valve?

Thanks.  I will the the P-lead going into the black box.  Hopefully I find a loose wire.

Usualy wires in electrical systems gets broken near of connectors where there are an elasticity change.

Disconnect connectors and perform a continuity test from switch to connector.