Found source of a lot of noise on boat audio

[jmvotto]

Thought the op ran the route of the source b+ and when adding a 2nd battery the noise got added

[Rugburn]

You are right jmvotto. No noise, single battery. Noise generating from ground cable, two batteries.


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[MLA]

Thought the op ran the route of the source b+ and when adding a 2nd battery the noise got added

Ive looked back through this thread and the OP's previous threads, and cannot find any mention of how the audio B+ cables are routed.

You are right jmvotto. No noise, single battery. Noise generating from ground cable, two batteries.

Thats correct. One battery = one voltage source. Two battery = a difference in potential that will want to eqaulize through the ground shielding. Disconnecting the ground link turns the house bank into a stand-alone bank. I see this as one more step in the diagnostic process, not the cause and final fix.


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[jmvotto]

So you are stating that the introduction of a 2nd battery with greatly increase the amount of white noise, plus make it more difficult to isolate the noise.

[MLA]

The simple act of adding a 2nd bank, is not the cause of the noise, not saying that at all. If the dual bank wiring scheme is not 100% accurate, unwanted noise can be induced.

[jmvotto]

would you assume the factory did it correctly ?