Waltery

After 2 to 3 days the battery on my 95 SC300 drains so the car will not start. It appears to be a problem with the factory alarm system. The battery drain is in unison with the flashing of the dashboard security light. When that circuit’s fuse is removed the drain disappears. The battery and alternator were replaced before the actual cause was found. Can anyone offer a schematic or suggestion on how to fix this problem?