Have 2006 Impala, The check charging system light and battery light come on , Then head lights started flicking. I checked the battery found some corrtion on red termail cleaned and teasted battery all good, then checked volts 12.5 when running 14.5 volts , Checked cables from fuse box to battery all in good shape all secure , Still having issues radio fades out high beams lights work sometime then sometime not when turn on. Its like something is not making a good conduction cant find anything lose or in bad conductions ????????? Also front radio speakers dont work just back speakers also cant hear on star no sound . Thanks