I have a 2003 6.0l F-250. After sitting for 4 hours tried to start the truck and it wouldn't start, just clicks. I've load tested the batteries ( load tested good ), checked power at large terminal of the starter (12.3v), checked power at small terminal (11.9), removed starter and bench tested it ( worked fine ), replaced starter ( same problem present ), ran a jumper from battery to small terminal on starter ( solenoid engages but starter motor doesn't spin, checked starter relay to see if it's clicking ( it's clicking ), swapped starter relay for a known good one, performed pin point test per Ford manual ( all test good ), so I was afraid engine was seized so tried to turn motor by hand at the crankshaft dampener and it turned easily enough. I'm stumped. Any suggestions ?