significant noise

Hello everyone. When in doubt and after wasting so much money at installation shops.. I come here.... Should have come here first!

Ok I have a 2006 chrysler 300. The battery if you are aware is in the back. I have a pioneer avic n2 installed and want to have 2 amps installed. 1 four channel and 1 two channel. I dont have anymore money to get the 2 channel amp for now due to the fact that I took my 4 channel amp to get installed at circuit city. (yeah i know first mistake) they wire the amp and run rca's from the head unit to the amp. When I turn the car on there is a ton of noise! whining and also I can hear the fan on the head unit humming noise in the speakers. and the whining noise when accelerating. The guys there tried everything from changing the rca wires, thinking it was my rca outputs on my head unit and running the high inputs (wires not rcas) and still the noise was there. Could it be the amp is too close to the battery? I am just so depressed at this I dont know what to do.. any suggestions? they even grabbed another amp and tried thinking it was my amp and the noise was still there... the headunit is wired through the chrysler wire harnessed ground could it be that? THIS IS JUST SOOO ODD. the ground for the amp is connected to the battery directly. the rca's are kicker 4 channel rca's. Any help people would be much appreciated. Could it be the way my head unit was installed? they wired my acc wire for my head unit to my lighter as apposed to directly my ignition.... could it be that? the amp i want located right behind the wheel well of the trunk. both sides.. should i move the amp and see if it is too close to the battery and that is it?

OK, first things first.  If you paid for an installation and it is unsatisfactory, don't leave until it is done right.  Make them fix it.  Demand to speak to a manager and raise hell until it is done correctly.  If they say they cannot do it correctly, tell them you want your vehicle returned to 100% stock exactly the way you brought it in, and that you want all your money back.  Do not accept slip-shod work, especially from a gigantic company like Circuit Chitty.

Next, yes it sounds like you have major ground plane issues.  Try a dedicated ground for your HU.  Is it a Pioneer?  If so, that could be the entire problem as they are known for crap ground planes.

But bottom line is don't let CC push you out with a crappy install.  Raise some hell and get them to fix it or remove it.  And next time, try a REAL car audio shop. 

If the HU is under warranty, get it replaced.  If not, you're screwed.