Minn Kota MK-330 question

[tryn2lrn]

I received my MK-330 charger but don't have my new boat yet so I figured I would just hook up the charger to my old boat batteries and 1 from my tractor to try it out. 2 banks said charged which I expected and 1 bank went on charge, after about a half hour the charger was buzzing pretty loudly, is this normal? It was only charging on 1 bank at 10 amps and it was way louder than I expected, if all 3 banks were running and each of them sounded like that.....well lets just say not what I expected. If this is normal that's ok, I just want to make sure. I think I will switch the batteries around an verify if each bank sounds like that. I hope it's normal as return shipping charges will eat up the rebate they have going. Thanks for the help.

[mark Z21]

mine is the same loadness weather it's charging one bank or all three, so it's prob normal

[tryn2lrn]

Yeah I switched them all around and they each do it so I am guessing it's normal as well. The temperature sensors really work too, I was monitoring it and it was up to about 14.6v then I grabbed the sensor in my hand and the voltage dropped and it shortly went into maintenance mode......sweet! Pick up the new baby bug 4 days. Thanks