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Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 10748
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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I just plugged in my minnkota inboard battery charger and it

Customer Question

I just plugged in my minnkota inboard battery charger and it reads "check connections". Its a twin battery charging system. Will it do this if the batteries are dead?" If they are dead enough to make the light go on are they typically capable of being recharged?
Submitted: 2 years ago.
Category: Boat
Expert:  Tan replied 2 years ago.
Hello. Yes dead batteries will make the charger act strange. If the batteries have been discharged for awhile they may not take a charge. They will need a fast high amp charge to get them started if they will come back to life. Let charge on high for 20-30 minutes then reduce the charge rate. Let charge on low over night then load test the batteries. If they hold a load then they are ok if not replace. If the batteries are 2 years or older then I would replace them. Average life of a marine battery is 2 years. Post back if you need further assistance. Thank you.....TanYour chargers is to maintain a fully charged battery. They don't work on a dead battery.

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