I installed an audio system on my boat and I dont think the grounding to the negative terminal is doing the trick? I have engine noise and static and hissing and whining noises when I turn on the motor, when the boat is off, everything sounds good. Also i have a power issue batteries are kinda old and I'm think of replacing them with blue tops? or should I go batcap or kinetic? Blue tops with a capacitor is what I'm leaning towards because of money issue.... Any recommendations?
