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electrical problems - TrailBlazer

clintlpeclintlpe Posts: 1
edited December 2016 in Chevrolet
i am having voltage problems with my 08 trlbzer. i have replaced the battery and alternator twice. the volt meter will drop to 12 volts ruffly at an idle. the blower motor will slow down as well. then when u press on the gas pedal the volts comes up to normal range. but the while driving volts go up to around 16 volts. the regulator was bad on the second alternator so i replaced the alternator. drove to MI and everything was fine i go to the store tonight and the volt meter starts acting up again. the head lights go dim and the blower motor dies down until u press on the gas pedal please help. its about to drive me insane.
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