hey guys I just bought a 2001 Cadillac sls to fix it up. At the place where I looked at it there was no lights inside at all. thought the battery was dead. they gave me the battery jumper and it started up. I test drove it for cuple of minutes and it ran great. Had it towed home and got a new battery and still same thing. lights come on when you plug the + cable and soon as you turn the key the lights go away. I took out the battery and it shows 12.6v and after I put it back and connect it it shows only 6v. it looks like it has a short somewhere or the RIM module might be bad?