I had an old fiat car where it had some unknown electrical problem that would run the some fuel pump thing all the time, even without key. So the solution my gr

I had an old fiat car where it had some unknown electrical problem that would run the some fuel pump thing all the time, even without key. So the solution my grandfather figured out what a kill switch under the dashboard for the fuel pump. Wouldn't start without flipping it. I want this, but on my electric car. Fuses aren't usually so accessible. I made a switch like this on my next (gas) car, but I could get the manuals and find the spot in the wiring diagram. I have no idea how to do this for a tesla. I don't think the fuses are so accessible in evs.