Where are the general locations for kill switches on riding mowers?

I have a Huskee riding mower I bought a couple years back and one day it wouldn't start. Occasionally I could get it to start once in a blue moon it would turn over and start but now, no luck. I've tried replacing the key switch- nothing. I've tried bypassing everything by using jumper cables to the starter -still nithnno but the engine turning over, not hitting a lick. My guess is there's a safety kill switch that's gone bad or some faulty wiring.
Anyone have any ideas on where about I...

Where are the general locations for kill switches on riding mowers?