answer to the start up problem with XG350 2004 hyundai on 2004 Hyundai XG350

My car will not start up after putting a new battery in the car. the seems to be an electrical short the an not be found that is slowly draining power ffom the battery. the car has been to the mechanic three times and the problem has not been located.

Asked by for the 2004 Hyundai XG350