09 prostar with ISX randomly shutting down

[Waterloo]

Check for that thermal breaker, and for good measure replace that spade style fuse, and check the contacts in the holder. These fuses will go buggy and still look ok. It has happened in my dash on more than a few occasions. The scan that the dealer can do only takes a few minutes, literally. What a bunch of bone heads. I would pull up at lunch time and flip one of the mechanics $20 bucks to bring the laptop out to the truck, plug it in and look for any codes.