Hey sorry I seen your question a couple days ago but I couldn't respond had to wait until I got validated. Anyways. When my battery kept going dead it turned out to be the FSU. If your car is off or even when you're driving does it sound like the fans kick on or act up weirdly? If so then the FSU is your problem. I got one off amazon and replaced it easily with no problems. Just removed one screw on passenger side and then slid it in.