Electrical Fault with a 2009 International Prostar

All those modules should be logging fault codes. Sounds like it could be just ignition power is being lost to 1/2 the truck. Could you find out if there were any fault codes being logged?

 

If the ABS/traction control warning lights are coming on during the no start this means the engine ECM is not booting up at key on. This would be loss of ignition power to the engine and/or main battery power.

 

Maybe your ignition switch if the throttle dies? If it happens while driving, pull it out of gear and see if the engine stalls. You need to find out if the engine is getting fuel. If you're not getting fuel and you pull out of gear, the engine will stop. Just keep in mind you lose your power steering when you do this. You need to get to the bottom of this.

You can also find out what hot wires are on the ECM. The ISX has so many wires and harnesses, you may need to study what goes where.

 

I would check the cables at the mega fuses at the fire wall near the air filter. There is a standard fuse holder hiding in behind there that is power for the engine. Remove the fuse and check it for loose pins or corrosion. Checking all your battery cables and ground connections would be a good idea too! Remove the fuse panel cover in front of the passenger seat. Read the panel diagram and look for fuses and relays related to ignition, engine and abs. Wiggle them gently with the key on and see if anything happens. We see the terminals that fuses or relays plug into get so loose that they barely make any electrical contact and cause intermittent issues like this.

 

The fan clutch is controlled by the engine ECM. I would say it is a separate issue or another symptom.

 

Did you figure out the problem? Mine started doing the exact thing Saturday