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sylverado 2500hd 2010 charging problem

Discussion in 'Chevy Trucks' started by jimmysnow, Jan 25, 2012.

  1. jimmysnow

    jimmysnow Junior Member
    from 81611
    Messages: 18

    my new truck have charging system problem i have 2 new battery a new 160 amp alternator but the tech told me the computer cut the power for alternator for economy mode.my new blade kit in fisher xls.....the voltage at idle drop to 12.75 and the light turn yellow...any idea ????? what i can do...on the garage scanner the duty cycle for alternator go to 35 and it is 70 when every thing is ok...thanks