Put the engine back in and put a lone single wire on the same stud with the main ground in the engine harness to and it started smoking. After that no crank no start all I get is the starter hitting the fly wheel. Checked all the fuses they are good. Battery voltage is 12.6. Swapped the relays and swapped the harness from a running truck after all of that still the same problem. Any ideas of what it could be