Batteries not charging

[Tackdriver]

My on board two bank trolling motor charger is not showing a green light after 24 hours of charging as it usually does.Two of five red lights remain lit on each battery. Water is above plates.<br />How can I test the system to see if the problem is in the charger or batteries?<br />Batteries 18 mo. old Charger is 5 years old.

 

[rattana]

Re: Batteries not charging

Do you have an ammeter gauge on your charger? What is the amperage reading on the gauge when charging? A discharged battery should draw 5 - 10 amps when charging.<br /><br />Check the voltage across each battery when the charger is charging the batteries. <br />12V batteries should have 13.5-14V across it<br />24V batteries should have 27-28V across it. This would indicate an output from your charger.

 

[Tackdriver]

Re: Batteries not charging

I went to a heavier, shorter extension cord, toped off with distilled water, and banged each corner of each battery with a rubber mallet & recharged. Green light came on about 4 hrs later.<br /><br />Thanks,