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Hello, my name is***** will assist you.
Check the wires on the back of the key switch. With the key off, the red wire should still show 12V between it and a ground. If it does not, there is an issue with the plug in on the engine or in the harness. If it does, turn the key to the on position and see if the ignition wire now has power as well. If it does not, replace the key switch.
To get more detailed, I will need the model number from the engine.