Truck shuts down when making a turn

[Waterloo]

I would start at the ECM, the wiring. Start at the battery box, if it has a direct feed to the batteries, that is where I would start. Make sure your batteries are secured properly too, not sliding around in the box. I have seen this on other trucks, it was a bad ECM wire connection at the battery.

If that looks good, check under the hood, make sure the harness that carries the ECM wiring is secure and nothing is rubbing up against it, etc. If nothing there, crack the steering wheel open and inspect the wiring leading to the firewall. You will be looking for lose wires and such. Make sure everything is secure.

Also check the in line fuse to the ECM, should be under the hood somewhere. Inexpensive to swap out, just a regular push fuse in most cases.

That is where I would start, all easy to do yourself and should not take that much time.