On my 2016 375 Freedom, when the motors and ignition are off, the center motor start/stop button stays dimly illuminated. Battery switches are on. Anyone know why this green light is staying illuminated? Thanks for your help.
An external issue with shore power or stray current could result on small voltages on the ground bus. I would not expect that to be enough to light that LED but I would recommend checking out the isolator and check for stray electrical or galvanic issues.
I suggested removing the shore power cable to see if there is any change to the small AC voltage reading. If not, I would move the boat away form the dock and see if that low voltage still displays.
My concern other than a defective AC panel is that there may be an stray electrical issue and that can lead to damaging electrolysis.