I am busy installing sound in my car. I have installed an amp and have VCC running to the battery and ground connected to the body of the car. I have noticed that there is noise, seems to be a high frequency noise, that is produced when the amp is on. The pitch of the noise increases when I accelerate (this is quite annoying). This noise did not happen when I didn't have an amp so I'm assuming its the way I have connected the amp. I would like to know if this is a common problem and any suggestions on how to fix it would be appreciated.
Extra: after connecting my amp my radio reception is terrible, I noticed that my aerial is also grounded to the body so I'm wondering if the amp could be affecting the aerial.