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try DISCONNECTING the oil pressure sender at the block, from the wire, this will tell the anti start while running relay, that it is not running no matter if there is a stuck pressure sender or not, the oil pressure sending unit could be holding or sensing a bit of pressure when cold

can i PLEASSE bring a truck to my place, i promise that i will take care of it and find the problem, all at no charge to the U.S. ARMY, this is a GREAT deal, i would not be slow on acting on the offer.

still sounds like a bad ground. though could be as simple as the cold causing condensation, in a relay, making it stick open (example the oil pressure switch relay that keeps you from trying to start the truck if it already running) the heat dries it out ,could also be getting a false (as has...

does the starter solenoid click when first engaged, if so there is a good chance that the solenoid contract disks are BURNT, some times the disks stick because of crud and don't rotate thus making contract in one spot and causeing them to burn and no longer make contract or little contract and...

could be the motor control box if it has one like the 809 series, still think its bad gounds and most likly the same bad ground spot on ALL the non starting trucks

look for a bad or LOOSE grounds