Driving along 2006 supercharged, dashboard goes nuts fault warnings and chimes and lights, radio kicks off, then the whole dash lit up, and promptly went dark. Get it home thank god, and find a loose battery terminal. Tightened that, checked all fuses, battery showing 12.7. Start it up, and check the voltage, 16.4. rechecked and confirmed. Is this even plausible? the alternator is less than a year old.