Finding the right solenoid has been a bit of an adventure. I started off with a typical Ford solenoid but then learned that I should use a diode suppressed solenoid to protect the ECU. So I got a diode suppressed one and then I figured out that I needed some way to make the neutral start function work. So now I'm shopping for a third solenoid. Good news is these things are cheap. I give my mistakes away to a buddy who is a Ford guy.......
Have you thought about one of those cable shut offs the See Doos use when a person is thrown off? Break away on a trailer comes to mind to also, but maybe not enough amperage. Then there's the fuel pump shut off on vehicles in an accident, this would shut down everything if driver was incapitated, might make a difference till safety personnel could get there. Good to have backup systems.
