I was riding on freeway first 3 warning lights came on SRS ABS etc.. then every single warning light start to came on, Parking break alarm etc. Towed my ML320 into shop, They are saying battery and alternator needs to be changed. But no word on price yet i'll get it pretty soon, How much do you think i'll end-up paying for alternator and battery? I think around $700 ? inc tax and labor?