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Hi my name is Robert....
IF the battery was in bad condition the converter would try to work extra hard to charge the battery. TO start on this I would have the battery load tested, most auto parts stores will do this for free. IF the battery is bad replace it. If the battery is good then you have an issue with the converter, the converter will take the incoming AC voltage make the DC voltage and charge the battery. When you plug in you should not see more then 14.2 volts at the battery, if the voltage is higher 15,16 volts then there is an issue. Also make sure all your battery cables are clean and tight... I would advise to have the battery load tested to start and then check the voltage of the converter...
Hope this helps, IF you have more questions or concerns please feel free to contact me...
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Have a Safe and Happy 4th!
HI... was just checking in to see if my answer helped??? Please feel free to contact me if needed..
Have a Safe and Happy 4th!!!!