Wiring diagram for toro 74301 - Toro 42 In Deck 19 Hp Kohler Courage Twin Cam Zero Turn Mower

Request the wiring diagram from Toro.

The safety interlock system is designed to prevent the engine from starting unless: • The PTO is disengaged. • The motion control levers are in the brake position

You have to check both arm switches and PTO switch. AND somewhere/how there's a automatic park brake switch but I'm not locating in assembly drawing. If I've got the right model, you should hear the automatic brake deactivate when you pull both arms in and then set brake (default) when levers pushed out.

Make sure nothing is interfering with auto-bake. Once all the interlocks are satisfied, rotating off/run/start switch to start will energize starter solenoid.

Operator and service manuals available free from Toro.
https://www.toro.com/en/parts/partdetails/?id=27013

Model number is required to get the correct information you are needing.

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Toro wheelhorse Demystification Electical wiring diagrams for all...

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There are many reason a lawn mower dies in gear. Buildup of grass on the underside of the deck, mowing in too deep or thick lawn causing too much load on the blade, or the air filter needs cleaning.

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http://www.toro.com/en-us/parts/Pages/PartsDetails.aspx?

I'm not familiar with this Toro Model, but that click sound probably is the starter solenoid engaging. Have you checked the wiring from the battery to the solenoid and from the solenoid to the starter? Also, check the ground connection on the mower frame.
You may have a bad starter motor. You can by-pass the solenoid by - placing a heavy gauge wire from the POSITIVE battery terminal directly to the STARTER terminal, where the heavy wire is attached. Be careful NOT to ground out the wire from the battery.
If the starter turns - it's a bad solenoid. If it does not turn - it probably is a bad starter motor.

Go to www.toro.com then customer care, then manuals & parts, type in model no. and see if you can find wiring diagram in the manuals.