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Join Date: Jul 2007
Location: Cumberland Co. Pa.
You cannot depend on your motor to keep your trolling motor battery charged. Your motor should keep your cranking battery in a state of full charge providing nothing else is connected to the cranking battery that causes a constant draw.
It is absolutely essential that you connect your trolling battery to a charger after every day's use on the water. I don't know how your boat is equipped ,but if it is a new boat I would suspect that there is an on board charger that is to be plugged in to an electrical outlet at the end of each use to keep the batteries in a full charge condition. If there is not an on board charger installed on the boat you will have to connect the trolling battery to a portable charger after EVERY use to keep it in full charge condition.
My boat has an on board charger that is connected to all three of by batteries and I plug this into an electrical outlet at the end of every days use.
A battery that reads 9.0 to 11.0 indicates a dead battery. Your batteries should read in the high 12's or low 13's when fully charged with the charger disconnected. Depending on the charger you have, the reading should be in excess of 14 volts when plugged in and charging.
A battery with a reading of 9.0 to 11.0 ,could indicate a bad battery that needs replaced,you won't know that until you hook it up to a charger and get it to a full charge condition and see if it maintains that full charge condition for a period of time without a load, and that still is not full proof. You will need a load tester to see if the battery will handle a load before you can determine if the battery needs replacement.
Last edited by crappie-hunter; 06-22-2017 at 10:16 AM.
Reason: more info.