jamvisuals1

Hello, I have been having an on-going issue with my car and the stereo and speakers. I finally fixed most of it and then randomly the stereo is on, but there is no sound coming from any speakers until I pull out interior fuse #7 which the is "back up fuse" Can anybody tell me what this fuse controls because obviously something that is powered by this fuse is interfering with the speakers somehow. I also notice with fuse #7 in, the stereo stays powered after the car is shut off.