Hi there, I finally joined after lurking for many years. I have a 64 Impala that has a battery that is slowly draining. We recently had work done on the car and the battery was not draining before the work was done. When it was in the shop the gas tank (and sending unit), the voltage regulator, and the parking brake switch were replaced. The motor was out and cleaned up a bit as well. When I picked it up the tail lights were flickering and those were quickly fixed with the loose ground at the trunk lid light. I disconnected the e-brake switch but the battery still drains. I decided to jump in with a test light (The car is at my parents house and my Dad's meter wasn't working). I may be headed down the wrong path on my troubleshooting but I did find that the "Tail" fuse had power across it with the lights off, doors closed, trunk closed, etc. I also disconnected the trunk lid wiring connector and removed the other 2 tail lights. After that the "Tail" fuse still had power. Not sure if this is contributing to the battery drain or not and I ran out of time before tracing wire by wire with the diagram. I'm assuming that crossed wires would short and blow the fuse. The fuse block in the attached photo is not the actual one. I found that on the interwebs. Ours is not corroded. A few questions: Where is the best place to start troubleshooting a battery drain on this car? Could the voltage regulator being replaced lead to this (wires not hooked up correctly, etc)? Should the "Tail" fuse have power with nothing on the car appearing to be on? Any suggestions are appreciated.