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I would reccomend it as the stereo can drain a battery pretty fast and the last thing anyone wants is to be stuck on the water with a dead battery.

You can still do all the amp troubleshooting...

Generally any whine threw the stereo is a lose or bad ground and the stereo is the most sensitive part and having an amp on it will obviously amp this bad sound.

When you have the boat sitting...

No not at all on the engine. Set it up how you want it. Then if you got a fake a lake you can start the engine to see if you have a whine. You can also just turn on the bower fan, heater, things like...

Sorry buddy i might have mis read your last post. I thought it was only saying you adjusted the gains. I missed you saying you relocated the ground directly tot he battery. My only concern was...

Honestly i don't think your problem is solved. I think all you did was lower your overall volume by gaining the amp down and the whine is there still you just don't hear it as much. I would still...

Thats your problem right there boss. DO NOT ground the stereo to the boat ground block with your gauges.

You must run all your stereo grounds to the Battery Negative. This is not a car and there...