Re: Not start 2008 Ford 6.4 liter.
Usually, that clicking indicates not getting enough juice to the starter. Have you tried to jump start? Might consider pulling the batteries & having them load tested - they can read 12 volts & still not be able to spin the starter.
2004 F350 CCLB 4x4 Dually - EGR Delete, Coolant Filter, 5" Exhaust, Evolution tuner/monitor, Leveling kit & 33's
1960 F250 4x4 - 400/C6