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View the latest post Attachment(s) Battery charger only charging Genet battery?


Hello all, I have a 2001 Mariner 350. It has 2 main batteries and 1 battery for the generator.
Recently the engines would not turn over so I replaced both the main batteries. When I went back to the boat 2 weeks later, those batteries were almost dead. The boat is in a wet slip with dual 30 amp power.
So i checked the battery charger and it appears it's only charging the Genset battery. The charger is a Mastervolt 12/3-40. I can check each bank and it shows that the main battery is low. (Shows a series of light bars and while the genset battery shows 3 yellow bars which is good, the main batteries show 1 red bar not so good)
Is it possible that the charger has failed?
I checked all the wiring and nothing loose or corroded. Checked with a volt meter and it seems like its only putting out a reduced voltage (7 volts or less). Maybe swap wires from genset to main and see what it does?
I am thinking I will have to replace the charger as I am not sure how to further test and / or fix this issue.
Any ideas?

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