5.4 triton no crank no start
Truck ran fine when I parked it, next day no crank no start. One solid click at the starter. Previous experiences show this being a faulty starter or solenoid so I remove it and take it up to the part store to test it. It fails, I buy new one and install it. No change. Change the starter relay, no change. Check every fuse I can find that has any connection to that system, all good. Remove serpentine belt and try to manually turn crankshaft by hand, won't budge at all. I can't believe it would have seized without any warning. Running 5w20, changed about a month ago, still at a good level. I've hit a wall, please help.
