peterbilt 387 with ISX engine shuts down on adn off

[Starlight]

I had this same problem about a year ago. It took me a couple days to go thru and test all the applicable wiring. It was a bad ecm. This guys initial problem was that it died going down the road and somehow had also caused all the gauges in the dash to go dead. It would crank but nothing else worked. The priming pump also didnt work. With a new ecm everything came alive again.