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Christian If you have a volt meter it should read around 14 volts (14.7)with the engine running, if not you either have a charging system problem, or batteries that refuse to take a charge(bad cells).If you have an amp meter 12 amps is ok,that should be about max output. But your battery is getting low. I would get rid of both batteries and replace with one good quality marine battery.One is plenty for a day boat.
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