Re: Simplicity 17 GTH-L keeps shutting off
The breaker is tripping because of an overload. You need to find the short or bad component. I would disconnect the battery, then put an ohmmeter on the breaker terminal and measure resistance to ground. If it's low, you have a short to ground, and need to isolate the bad circuit.
You don't say which way the meter is pegged - it makes a difference. If it's to the discharge side, that makes sense for a short to ground.
It's possible, as mentioned already, that the ignition switch is shorted internally to ground. Use your meter, after removing the connector on the switch, to test it for shorts to ground when in the "on" position.
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2006 Conquest, 54" deck, Vanguard engine