So i have a '00 eclipse gt, and i just installed my aftermarket stereo, that works great. But i cant listen to the radio. If i plug my phone into it, and listen via bluetooth, it works. When i turn the car on, i hear alternator whine. Also feedback issues with the radio. I have tried everything by trying to ground the rca cables to the stereo housing. Im kinda lost now. Do you think that my battery negative terminal could be the issue. The first ground coming off of the battery is pretty beat up, and corroded, but i cant find anything that says a bad battery ground can cause this problem. Possibly amp?