Re: Fresh rebuilt 7.3 no start
After rebuilding a engine there is going to be no oil in the oil rails to fire the injectors and it is going to take a lot and I mean a lot of cranking to get it there. The safety switch will only keep the starter from engaging.
Have you tried cranking with the valve covers off to see if there is any oil squirting out of the injectors? You also might want to check all the fuses if you haven't already. Mainly the #22 and #9 under the hood.
96 F250 XLT 4x4, 4:10 gears, 5 speed, Tymar intake and HX hose, downpipe, pyro and boost guages, coolant filter, Luc clutch