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Alternator whine injected by amp

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Hi all-


I have been battling with alternator whine for a majority of my car audio hobby. I have tried countless things. I had just made an LC filter to filter out noise in the power line of my radio thinking it was finally it, but unfortuately it remained. Then it dawned on me, I have 2 amps for speakers in my car now and I tried disconnecting the one I've had for years. The noise went away, which is great to finally know what is causing it. The problem is I don't have the cash to buy a new amp for my midbass.


Does anyone have any idea where to start troubleshooting inside the amp for something like this? I'm a fourth year electrical engineering student, so I'm quite confident when it comes to the internals; I just don't know where I should start.


If you need any more info just let me know. The amp in question is a 4 channel RF T400-4


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