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I HAVE A 2002 fORD f-250 4X4 WITH THE 7.3 DIESEL. IT WILL NOT START, CRANKS BUT WILL NOT FIRE OFF. I EVEN PLUGGED IT IN ALL NIGHT AND STILL HAD THE SAME RESULT. HOW DO YOU READ OUT DIAGNOSTIC CODES ON IT? i HAVE WONDERED IF IT COULD BE THE CAM SENSOR OR LOW VOLTAGE SINCE THE BATTERIES ARE STILL ORIGINAL. ANY HELP WOULD BE APPRECIATED