I have read the threads on ww.com about grounding your stereo equipment to the battery, but my situation seems a little different: I have two batteries (one deep cycle for the stereo when i'm beached, and one cranking battery for starting) hooked up to a perko switch for the starter/alternator. The accessories/stereo/etc power and ground wires are all hooked up directly to the deep cycle battery. The problem is, when the engine is running and the perko is set to battery 1 (the cranking battery) I get little to no hum in the speakers. However, when I switch to bank 2 or "all" to charge my deep cycle, I get a loud hum which I presume is a grounding issue. Why would this happen? I have the deep cycle ground wire running to the cranking battery which is what perko recommends, I just don't understand how the humming is only isolated to one battery... Please help, I'm getting so frustrated!
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