Our 04 Seville was driving just fine then after making a u-turn today the car acted like someone had turned off the key. We Coasted to the side of the road. There is no dash lights, no starter engagement, no headlights or power windows or door locks. It does however have interior curtesy lights. A New Interstate battery was installed two weeks ago along with a new starter. And until today everything was running just fine. Any suggestion as to what might have caused a sudden power loss shutdown while driving in this 04 Seville SLS is appreciated. Both battery cables BTW are tight.