420 Won't Start

I can jump the solenoid with a wrench and the tractor will start with the key turned on. No issues, I can mow the whole yard but once I turn off the key switch I've got to jump the solenoid again to start it.

I had issues mid winter when the brain box terminals were corroded, those got cleaned and dialectic greased. At which time I did all the plugs on the wiring harness.

I've replaced the solenoid, key switch, fuse block. It just won't send juice to the solenoid when I turn over the key switch. Is it a safety switch?