HOBART, Ind. — At the end of the 81-year marriage, the Isaksons said goodbye by turning off the lights. The partnership was over. The Chrysler sign went dark. It was an unceremonious finale to a four-generation bond between one family and one company, but it was not a surprise. Rob Isakson had known for weeks his dealership was on a Chrysler hit list _ the cuts were part of the troubled automaker's survival strategy. Still, when the moment arrived, he did not go gently into the night. "It hurts," he says.