I recently bought a 99.5 AEG 2.0 Auto that was not running due to a bad Head Gasket. Once I got it running noticed it was not charging the brand new battery. I had the alt rebuilt and bench tested when done and everything checked out. Once installed it is putting out 12.3V when idling. I replaced cables and cleaned grounds under battery and same issues. Any ideas? I don't know where to go from here. Thanks for the help.