09 Maxxforce Dt Electrical Problems

Hi All! New to this forum. I'm grabbing for straws at this point. I have a 2009 IC CE300 school bus with a Maxxforce Dt engine, Allison 3000 transmission. Bus has 105xxx miles on it. Where I am we are owner operators ;( The bus broke a little over a month ago it just randomly was shutting off so I brought it in. I bring it to the local international dealership here. They said a fuse fixed it and went on my way two days later it began behaving weird all sorts of lights coming on the dash, brought it into the international place here and they diagnosed it with a bad ECM, replaced ECM.(ECM had burnt pins on the gray plug) Bus was still just randomly shutting off and crank right back up. I did notice that when you first click the key on there was an * that said low coolant level and it would just disappear. The dealership said I had a bad engine harness, replaced the wires in the harness. Picked bus up, kept doing same thing. They've checked ground wires, harnesses, ICP etc and can't find anything wrong. When its placed on the computer, they get no fault codes. All levels of everything are perfect (oil, fuel, etc etc). They seriously told me that had no clue what was wrong and have been in contact with Navistar. Last communication I had with them was that they've ruled out a harness issue that it has to be a circuit issue but theres 200 circuits. They tell them test this that etc and it comes out normal. I'm at my ropes end as I've had to rent a bus daily until mine is fixed, plus the note that I'm paying on mine while it sits in the shop. It has been sitting now for a month. Anyone experience this? I'm ready to throw the entire bus away but I can't ;(

 

Thanks I'll have them check that tomorrow morning. They(dealership) told me they checked all wiring. My husband believes it's something with the ignition. One thing I notice when it just kills is the yellow triangle comes on and then it says Warn Engine, low coolant will flash, then back to Warn engine. Will update as soon as I know something.

 

Picked it up today didn’t go 3 miles before it killed. Guys came back met me with computer gave out code- bank a open.coil short? Crazy thing is I have this 2 way radio and gps tracking thing the school board installed; thing has been on in bus all weekend without keys in ignition. If I cut bus off it still doesn’t go off!! It’s supposedly wired correctly idk will keep updated. This killing was happening prior to new ecm!!