Have a 07 ram 2500 6.7 with full delete. I put a high pressure a/c line on this weekend and now for some reason when i was charging up the a/c system the truck just turned itself off. It started right back up no ck engine light nothing, i drove it about 10mins. ran fine left it running and did it again I pull the passenger wheel well back out maybe pinched a wire nothing was out of place. i drove it about 20miles pull up in the driveway went dead again this time you couldn't start it back up all acc. lights came on the dash .kinda like the ing. switch went out.tapped the starter nothing tapped the ecm a buzzing sound it started then the poo3a i think the "boost module code" it wouldn't clear Just not sure why it would run fine and then outta nowhere it just quits.

 

It sounds like you've got a tricky electrical issue. When a truck suddenly dies without warning, it can be frustrating to diagnose.

Here are a few things to consider:

Check the Electrical Connections:

Double-check all connections, especially those near the A/C system.
Look for any loose wires, damaged connectors, or corrosion.
Inspect the ECM:

The ECM (Engine Control Module) is a crucial component. If it's malfunctioning, it could cause a variety of issues, including sudden shutdowns.
Consult a Mechanic:

Given the complexity of modern vehicle electronics, it's best to consult with a qualified mechanic. They can use diagnostic tools to pinpoint the exact issue.
Consider an Electrical Specialist:

If the issue is electrical, an automotive electrician might be able to diagnose and fix the problem more efficiently.
Remember, troubleshooting electrical issues can be challenging. It's often best to seek professional help to avoid further complications.