when you say the truck is dead, does it like the batteries are dead// or does the elctrical system seems to be ok, except it wont crank??
Ok, has this vehicle been jump started?????? couple of the things to look at here, one being a bad transmission control module? the other possible wiring problem. here is some info on this concern!!
DTC U0101, No Engine Crank and No Tech 2 Communication with TCM - keywords control engage MIL LCT1000 MW7
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
A few TCMs have been returned from the field for analysis because of the following symptoms:
The field returned TCMs mentioned above were analyzed and found to have two battery ground nodes inside the TCM damaged by excessive electrical current passing through the heatsink of the TCM. The nodes affected, described as wire-bonds, are tied to pins 9 and 69 (battery ground pins) of the TCM.
Warning: The TCM is manufactured so that the heatsink of the TCM is electrically isolated from all vehicle electrical systems including vehicle chassis ground. Do not ground welders, battery chargers, electrostatic painting equipment or any other electrical devices to the heatsink. Disconnect the 80-way connector from the TCM when electrically welding on the vehicle.
To avoid damaging a TCM in this manner, NEVER ALLOW the following:
Note: Visual surface pits and carbon deposits are typically found on the TCM heatsink when high energy arcs are generated by shorts between the heatsink and battery power.