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Just a shot in the dark but , Remove the positve battery cable from the battery and make sure the threaded stud is clean and all there . My wife's 02 Denali was giving me fits a few years ago not starting and slow cranking and the head lights would dim at idle. It ended up being the positive cable stud. it was almost completely gone. Put a new one in the rubber housing and cranked it down good and tight and have not have a problem since.
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