Hi I have a question. I had a 1987 Cadillac Fleetwood Special 60 series and everything worked perfect. The car was a one owner, with 55K original miles. All the sudden, nothing works. No lights, interior lights, starter or windows. Nothing electrical works. The battery is new and is holding a full charge. Any ideas??

Thanks, Patrick

 

Have you checked all the main fuses, battery fuse, ecs fuse,etc.?? Then check all the grounds that are in the engine bay. Assuming that you never shorted anything out while changing the battery then maybe the ecm is fried.Also check GA trans fuse.