Just purchased 2007 Tahoe, and it had some sort of stereo or alarm system that required a 2nd battery and has a little led green light indicator under the steering wheel. Has been draining both batteries and killed alternator... replaced alternator and grounded a loose wire, but is still draining batteries. I need to know HOW to get this weird, extra system of electronic nothingness out of the vehicle. Do I start at the 2nd battery and work backwards? Any suggetions as to what kind of thing is IN the vehicle? FYI I am the wife of the man doing the work on the truck so bear with me on the terminology.