Are you sure you got the right Tac wire? I have the same issue. Mine turns on and all the lights go on. I can even turn it off and the sound go way up. However, when I turn the motor over and run the boat up to the preset RPM level (V8 = 2,500 rpm), the sound stays at whatever level it started off at. I called Jim at HSE and he is helping me find the correct wire. I think I found it but I haven't had any time to check it out. Let us know what you find out.
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