I have a minkota 440 pc.i just had a battery go bad on my boat that was about 6 months old.i installed new battery and checked to make sure all batteries were charged up to 12.7.i plugged in the charger to make sure it would check batteries and then go to green.i waited about an hour and checked charger and I have two green lights and one is showing two charging lights and the cranking battery is showing three charging lights.is there a way for me to test the charger to make sure it’s working properly.my cranking battery is an Agm battery.not sure if it’s supposed to be charged further than 12.7.any info will be great thank you