I am currently dealing with a unfixable problem with my 93 c1500 5.7. It was entirely rebuilt. Motor, trans, everything drivetrain is new or rebuilt. Nothing on the motor was reused. New fuel pump, new fuel screen, new fuel filter. All new sensors and new grounds except battery terminal wires cause they still appear good. I've recently been trying to solve this no crank no start. Battery is new, alternator is new, not a refurbished one. My battery charger indicates the battery is full of charge, yet it wont start. In fact the truck acts like it has little to no power at all. Interior lights are dim, dash lights come on, but that's all. The truck will start with help of the battery jump box. She'll start up and just chug along as if nothing happened at all. I have been through 3 new batteries since this issue started. I have had my alternator tested. I have checked every single fuse in the truck. Nothing was blown. Has anyone experienced this with these trucks ??