my 05 lly duramax sat for a month. I just went out to start it and the batteries are dead. I grabbed my charger and hooked it up on 60amp start... cranked slow so I turned it up to 200amp start. fired right off, I walked up front, disconnected the charger and it died. Now, it will crank like crazy but, no start! Any ideas???

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Got it... I forgot that after a jump start the fuel pump doesnt always come on line. A few quick pumps on the primer and she fired up! Good to go