What makes a mower NOT turn off after switching the key off

I just changed the motor out and it was doing this in the other mower also, I thought after switching the engine into this newer mower it would fix this problem also, change engine because other engine blew
 
That basically tells us that the problem is on the tractor side. With the key off you should have continuity from the ignition module wire through the key switch to ground. Some place between those two points you have a broken, or disconnected wire.
 
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