My rear window wiper, washer and roll down all failed at the same time. Do they share a fuse, or connector

I was hooking up an old speaker/subwoofer system that I had previously disconnected. It was creating issues and I was having to change out my alternator every few years. I must have connected the amplifier to the battery incorrectly, because the fuses on the amplifier blew. I replaced them and attempted to start my car again. This time, the fuses on the amplifier did not blow. But no my car makes no sounds when turning the ignition. No clicking, no cranking, nothing. My dome light, headlights, radio, alarm, dash lights, and power windows all work. But there is 0 ignition activity when… Read complete

Car is currently broken down, the key is having problems with turning and when I turn the car on, some electrical components dont work like the windows while others like the ac work just fine, the car isnt mine, im helping to fix it, the owner of the car says that there's a white blocky component underneath the steering wheel which the mechanic had said was the problem. As well as problems with the component which the key actually fits into.