So I was pulling up to my garage and i noticed that the low beams were "flickering" every few seconds. I look down at my battery gauge and it's going crazy, it never goes into the red but it gets too low for comfort.(this was 2 days ago) Tonight I stopped at a light and the headlights got really dim and then the tahoe shuttered like it was going to die. Alternator? I just put silverstars in a couple weeks ago, do they draw that much more power?