Starting issues, long cranking cascadia.

How old are your batteries? I’d make them take new ones out if problems not fixed

 

I thought it was your Truck, can’t stand to see anyone get ripped off. It’s your boss’ call. Good luck

 

Detroit shop. if you run out there the one in Des Moines does great work.. Interstate diesel been there for years they do fantastic work

 

you are probably missing a ground from batteries to starter, had that issue on 2 of our trucks. it caused long slow cranks, it also was grounding out through power steering hose for some reason. not sure if its related to your issue but that's what we had.

 

So you haven’t tried fuel filters yet? I’ve had problems with 2011 up to 2015 DD15’s, both the 2 filter and 3 filter systems. We change our own filters so there’s no one to blame it on but ourselves. But when we have an issue like yours, it has always been the fuel filters. We even have one truck we messed them up 3 times in a row, after we check the rest of the fuel system with no luck, it came in for and engine service, changed the filters and presto. It started like normal after the drivers day off. We have our best luck getting them sealed up by lubing the crap out of every O-ring before installing them. The installer shouldn’t forget there are 2 seals in the bottom of the big filter. People have forgotten to lube the inner one and we have found it torn a couple times.

I realize the $70 filter kit will be out of pocket (warranty almost never covers it) but it’s always been our issue....

 

I'm no diesel tech, or even a wrench for that matter... But maybe injectors? Or in need of running an overhead?