One problem related to battery dead has been reported for the 1999 Cadillac Seville. The most recently reported issues are listed below.
When I drive at any speed randomly the gas gauge goes to empty,windows don't work, ac goes off but fan still blows, power locks don't work, lights stay on when I stop and get out, but when I put the key back in and turn it to the "on" position and back off everything works again my battery went dead a few times due to the lights staying on and my girlfriend not knowing what's going on. . . What is that!!!!!.