I would get on the phone to marineco and talk to their tech people. I can see your unit going bad but showing green lights says your getting power to part of the circuit boards and getting green and both banks not charging is odd for a dual bank charger. Normally you will just lose 1 bank and get a steady charging light. Might get lucky and they might help you out. One thing I would do is replace fuses just for grin's.
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IceNitro LIKED above post
If you're not getting any voltage to the leads of the charger, the charger is either bad, or the fuses are blown. It's pretty much that simple. With the "green light" on, the charger probably thinks the batteries are charged and is not putting out any voltage. Unless there is a way to reset the "brain" to where it's reading the battery voltage, then it's probably a goner.
Test the fuses with a test light.
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"Life without God is like an unsharpened pencil - it has no point. "AMEN""G" LIKED above post
Thank You for all the post! Update I checked the continuity of fuses and there fine, I’ve attempted to contact Marinco twice and they transfer you to a third party company voice recording to leave message for their charger. So I plan to replace the charger also, but Before I purchase another 2 bank, im considering adding another battery to separate my cranking battery from my Electronic’s, im stuck with this decision because of logistics, currently all the extra wires and fuse blocks for my electronics is ran to the rear, would love to figure out a way to install it back there, but if pushed comes to shove I could eat away at my front storage and re route all the wires, but that seems like more of a challenge! Any thoughts from you guys?
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Why not install a 3 bank charger if you need a new one?
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D currently have a 2 bank charger on the front ( which is bad) if I have to put the third battery in the other front storage area I will go with a three instead of a 2, just trying to figure a way to install another battery in the back which is on a separate charger
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"D" LIKED above post
Replace your existing cranking battery with one of these and you won't have any problems.
https://www.samsclub.com/sams/marine...-also-viewed:1
And if you could get one in the 31 would be even better.
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Charlie Weaver USN/ENC 1965-1979
No, Mike I have no room in my boat. I am running an Exide group 24 deep cycle because it's all I can fit but it does a good job running a 998, helix7, airing or pump and my 12 volt marine metals air pump. All of which run from time I get in boat until it hits the trailer. But I did a lot of research on batteries for a friend that had problems cranking a 250 merc and running his electronics. Found that battery in the 31 was most powerful you could get at a reasonable price. It has held up great in his application. That 27 should have more than enough power to crank your big motor and enough reserve capacity to power all your electronic stuff. And I'm just guessing here and make this recommendation because I figure you have a problem thus the reason for adding another battery.
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Charlie Weaver USN/ENC 1965-1979