14 cascadia keeps shuting down on road

I have a 14 cascadia, dd15, 555k miles. Sometimes it shuts down over bumps some times it doesn't. I have changed ignition switch, master power switch. I have checked alternator, starter, battery box cables.


I have been told by one mechanic that he won't know what is wrong until it stops working. I don't like this answer. He hooked up the computer and didn't find any codes.

I'm not sure what else to look for. What are the run wires out of the ignition switch? Is there a master power cable to the ecm?





My truck exhaust has been modified otherwise I would go to the dealership.
Out of the ignition switch, which wires are the run wires?

 

????

 

Mine only does it over bumps. Was yours the same?

I'll change it anyway. Thanks for the quick response. It's a little un-nerving.

 

Just unplug it?