Engine shut down circuit needed

A warning to anyone who is considering offering to help with this project. Killing a car engine while it's running could be very unsafe. Another electronics forum web site I visit has a formal policy of "no automotive modifications" because of the risks.

This despite the claim that the circuit is not for use in a car and that it's a "safety circuit".

 

Yes I'm for real. I don't know you personally, so don't take it personally.

I know it's a "safety circuit"; that's obvious. We have no way to KNOW what you intend to do with it.

Perhaps if you explain the situation in detail you may be more convincing.
I have seen people deliberately mislead the forum in order to get help with a project that would be regarded as dangerous. One of them said something like "I said the circuit was running at 100V because I've found that if I say it runs at 600V, people don't want to help me". Then he deleted that comment!

Obviously, it's up to each person here whether they help or not; I'm pointing out to them that there is a risk if a vehicle is involved.

Those are some nasty pics.