Check the amp "ON" setting on the amp. I have a kicker 550 and had the same issue. My amp was set to turn on with the stereo signal and would basically amplify any little noise. Engine noise, ballast pumps, etc. I set the setting on the amp to remote (turns on with 12vdc) and no longer have an issue with noise. I knew I didn't have a grounding issue, since I just upgraded amps and all my wiring basically stayed the same. GL.
Tony
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