New to me Ferris has safety switch problems. Need help.

Just picked up a Ferris is600 with 86 hrs. Started up and ran fine on the trailer, I go to get it off and it won’t fire.

I try to jump the seat switch, nothing.

I clean the seat, brake, and steering handle connections and reinstall. Nothing.

I duct tape the brake lever switch down, nothing.

I jump the steering arm switches, finally it starts. I go to drive and mow, soon as I pull pto switch it dies.

I’m not that good with electric, where do I start? The seat switch is just 2 wires,...

New to me Ferris has safety switch problems. Need help.