Boat charger help

I’ve got Minn Kota 440 boat charger 3 to trolling motor charges and turn green after few minutes the bank to starting battery no flashing yellow at 1st plug in like others and never change stays one yellow please help new charger on 2021 zxr replaced today left Marina and got home to charger battery for A.M. and I told the rest. I forgot to say all 4 brand new agm 31

The trolling batteries did not need much of a charge.....green means charged. Yellow blinking light means charging....

Yes I understand but yellow does not blink thanks for replying

solid yellow is basically full charge mode, after a while it enters a taper mode with a blinking yellow light and finally green when fully charged.
MK charger lights

You can check it by unplugging the charger, put a digital VOM on the battery, check the voltage, then plug in the charger and see if you get an increase in voltage. If you do, it is working, if you don't then it is probably bad.

have you checked the fuses, made sure connections are tight?

move the solid yellow bank to one of the ones going green and see what it does.

not unheard of for a brand new battery to be bad from the factory.

get a load tester (very best way to check batteries) from wally world or a parts house and test with it, they cost about 40.00 and worth every penny.

Thx it’s working to all night to finally turn green this morning at 4 as I was heading fishing you guys are something else