There were some known issues of where the harness plug into the OBC. A row of small brass contacts inside the OBC on the circuit board would become loose or corroded and cause the motor to stall or not crank. Many U-Tube video's out there on how to open the OBC up and solder the contacts to fix the problem...
I have personally performed this repair on two Jeeps...
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited 
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Yeti StgIV Hot Tune
Week's BatteryTray
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2mic.Sec.Fuel Filter
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