Resquivel

UPDATE I took my old cranking battery to Batteries Plus so they can evaluate the condition of it. They tested it and the battery was still putting out decent CCA's. They advised the battery looks good for being six years old and it doesn't appear to be the cause of my issues. However, a new cranking battery is needed in the near future. They advised the on-board charger is mostly likely my issue. Based on everyone's recommendation, I ordered a new on-board charger. I ordered the NOCO Genius GEN2 charger from Amazon. I installed it in the boat and hooked them up and immediately received a voltage reading over 12.56. Also, I was able to fully charge the old cranking battery. It took approximately 2.5 hours to charge the new one and 8 hours for the old one. I checked the batteries this morning and they are well within the proper parameters. I know the old battery is probably on it's last season (if that), but I am pleased that the issue was resolved. Thanks for everyone's help! I greatly appreciate it!

I didn't notice any when I swapped out the new trolling motor battery. However, I didn't really look at the old cranking battery that deeply. I will definitely take a look. Thanks for the info! Will do. Thank you so much.

Thanks for the welcome and the advise. I will look into that. Thanks

I have a 2013 Bass Tracker PT175 TXW and my batteries won't receive a full charge from the on-board Guest 2 bank 8 amp charger (factory). Yesterday, I replaced the trolling motor battery with a new Interstate 27 series (same as factory). However, I still have the original Interstate cranking battery (old, but no issues). After 12+ hours of charging, my on-board charger is still displaying red and "charging". I checked both battery levels with a tester and they both registered 12.56v (medium level). To my understanding, a fully charged 12v battery should read 12.7v. With that said, prior to swapping out the tolling motor battery, the on-board charger stayed in red and "charging" mode with the old batteries as well. So I'm getting the same charging results with the new/old battery setup. Need some advise... Few questions: 1. Is the age of the original cranking battery preventing the on-board charger to fully charge both batteries? 2. If I replace the original cranking battery, will the on-board charger operate properly and fully charge the two new batteries? 3. Do I have a bad on-board charger? Thanks in advance!