Just wondering how you would wire in an emergency 'E' stop into a 12 volt or 24 volt diesel engine??
Do you have to wire into the ignition circuit or the fuel solenoid to prevent any chance of the engine running on?
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Since diesel engines don't have an ignition system, you will have to control the fuel shut-off mechanism in the injection pump.
Note that some engines (my Cummins 6BT, for example) require power on the solenoid to run, while others (such as a Ford Lehman I had) require power on the solenoid to stop.