I have 2016 Chevrolet Suburban LT. I change brand new battery and alternator.some time battery gauge display on my dashboard showing about 14 amp staying in middle with running engine .some time battery gauge go down around 11 pr 12 amp . Both symbols happened while I am driving or stopped my truck. Some please tell me why this happened. With original parts was never happened.l used original batterie and REMY Brand alternator.