So the 6.4 had a bedplate oil leak. We pulled the cab, and while we had the motor out and apart, we freshened it all up with a new low pressure oil pump, new bearings, push rods, lifters, rocker arms, etc etc. We got the cab back on and everything patched up, purged the fuel system etc. We installed an egr delete and 4in exhaust with dpf delete, so we re tuned the truck with an egr/dpf delete tune. Now for the problem. When you turn the key on and try to crank the motor, the starter will run for about a second or two, then stop before the engine has a chance to start. It does this everytime you turn the key, only turning over for a brief second then cutting off. Any ideas on what the problem could be? Im hoping its a simple fix, this truck is a problem child. Any help would be great!