Stereo second battery wiring question.

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  • Brian Sullivan
    • May 2014
    • 28

    • Mesa az


    Stereo second battery wiring question.

    So just purchased a 2001 super air Nautique a few months back and I am noticing when I turn over the engine to start it if the radio is on I'm getting the engine starting noise coming through the speakers. So hearing that I figure I'll looked in see how the past owner wired up the second battery for the stereo. And what I'm seeing is the stock battery hooked up to the main harness of the boat and the second hooked up straight to all the amps with a solenoid hooking the two battery's together. Once I turn the main switch under my feet on and type in the code and hit start the solenoid receives power and combines the two.

    Now my questions is this a good way to have it? My guess is my engine noise I'm getting is because the two batters are combined while starting. I looked up the blue sea add a battery and I think this would take care of my issue but not totally sure.



  • 92_Excel
    • Sep 2013
    • 1

    • Columbus, OH

    • 1992 Excel

    #2
    Interesting set up and the blue sea charger looks like a nice upgrade to the typical battery selector switch.

    As to the noise, ground fault loops and power cable feedback are typically the most common causes. You can try to isolate the source by connecting speakers directly to head unit and disconnecting the interconnects and remote switch to the amp and see if you get it. If not, then the issue is likely to be poor ground on the amp, interconnects that aren't shielded or twisted pairs, and speaker wires running too close to power wires.

    If the problem is noise from the head unit, running shielded/twisted pair interconnects to the amp instead of speaker level outputs helps. So does turning down the gain on your amp. Turn on the radio or pop in a CD, turn the amp gain and radio volume all the way down, turn the volume on the head unit up to 75% or so, then slowly increase the gain on your amp until it is as loud as you'd ever listen, the signal starts to distort, or your start hearing engine noise.

    Good luck.

    Comment

    • MLA
      1,000 Post Club Member
      • Dec 2009
      • 1312

      • Lake Wylie NC Area


      #3
      Describe the noise and is it only present while in crank mode?

      Comment

      • Brian Sullivan
        • May 2014
        • 28

        • Mesa az


        #4
        It almost sounds just like the engine cranking just through the speakers. And yes only while it's cranking. With the stereo off it doesn't happen. I think the blue sea automatic charging relay will solve this problem as it will isolate both battery's when starting. Right now they are combined by the solenoid when the boat is in the on position. I've never had a boat with two battery's so I'm just new to how you would wire one up

        Comment

        • MLA
          1,000 Post Club Member
          • Dec 2009
          • 1312

          • Lake Wylie NC Area


          #5
          Although i am not a fan of the dual battery/continuous duty solenoid setup in a boat, I have seen it done numerous times no issues like you describe, this is new. Im sure they during the rewire process to install a switch and ACR, the noise would be eliminated by default.

          Comment

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