Ampilfer Background Noise?

[izzy_domain]

Hey,

I have a 4 channel amp running my speakers in my car. I ran all the wires and did the install myself. After I originally installed it everything was working 100% great, but two days ago I removed my head unit to install two switches (they had nothing to do with my audio, I just unplugged the head unit to get more room), and then put the head unit back in afterwords. Now my speakers (when the head unit is turned on) I can hear a high pitched noise like feed back, and it seems to go with my engine, so as I rev the engine the high pitch noise goes higher. Anyways I can't think of a reason as to why this is happening. Any suggestions? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

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