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On Board Battery Charger?

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I have a Pro-Sport on board battery charger that was factory installed by Axis.  It doesn't seem to be charging my batteries as they are dead after only 3 years.  I faithfully plug in during storage and the proper LED lights activate telling me my power source is good.  I always shut my battery switch to off.  When I shut off my batteries to the off position will this isolate my batteries from my battery charger?   

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Trace out the wires from your charger if the go directly to the batteries then no your switch is not isolating your charger.if your wires from the charger are going to the switch before the batteries then it’s a possibility . Use a volt meter to check your charger to see if it’s working properly. 

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How long do we expect lead acid batteries to last in one of these boats?  Our other boat and home generator get changed every two years.  We have a Sequoia that gets changed on about the same timeline.  

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Check the inline fuses for the battery charger.  They may be near the battery posts or near the battery switch.  Check the voltage at the battery posts after the charger has been plugged in for at least 10 minutes. 

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With smart battery chargers I get 5-6 years out of battery’s in my boat and golf cart. 

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