My 2003 Chevy Impala 3.4L when I turn the key the dash lights light up but when I start the car they slowly dim where I can’t see them at all. I did the disconnect battery terminals hook up jumpers between the + an - for 15 minutes an then reinstalled them. Did the turn key on for 5 sec an off an on 3 rd time started car an they worked. Drove around worked great. Parked car shut it off went to start car later an cluster lights did the same thing as before. Fuses all good. Ground good. Any ideas???? Thanks for your time..