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won’t start

  1. 01-04.5 LB7 Duramax Powertrain
    batteries were weak so I pulled them out and picked up 2 new ones, NOW truck will NNOT start. I check fuse and what i found out is that if I pull the fuel pump 20 amp fuse and reinsert it, It will start if I turn the ignition withing 20 seconds or so, after a little time, I hear a relay kick...