I have a 2004 F-350 4X4 King Ranch, I recently changed out my batteries, fuel filters, oil filter / oil change, I also changed out four of the eight glowplugs. It will not start with-out being plugged in ! I've spent alot of money trying to coreect the problem ! I even put it on a computer and no errors came up ! Is there any one out there that could help ? please

 

did you check glow plug relay