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Yes, if the two 6 volt batteries were connected together in series.
Establish which terminal is connected to ground and disconnect the wire from the terminal. Disconnect the terminal on the other battery that is connected to the load. Finally disconnect the loop between the batteries.
Two 6 volt batteries in series, yes. In parallel, no.
Two six volt batteries in series makes 12 volts so switch the charger to the 12 volt position.
yes
Yes, series the two batteries to produce 12 volts. Tap off of the two end terminals for the 12 volts. Tap off of the series jumper for the 6 volts of one of the batteries. The two 6 volt batteries can not be paralleled in this connection as they will short out.
Connect two 6 volt batteries in series. Connect the other two 6 volt batteries in series. Now connect those 2 pairs you have together in parallel. You will end up with 12 volts.
Paralleling four sets of 6 volt batteries will still give you 6 volts. Two 6 volt batteries in series will give you 12 volts. Parallel these series sets will give you longer endurance at 12 volts. There is no way you will ever get 48 volts out of four 6 volt batteries.
Depends on the battery size. If your boat is a 12 volt system and you wire two 12 volt batteries in series you then have 24 volts. If the batteries are 6 volt batteries you will be fine. If you have a 12 volt system on your boat and want to use two batteries then wire two 12 volt batteries in parallel. You will still have 12 volts but will have double the amperage available and this will extend the running time of the batteries.
Two 6 volt batteries connected together in parallel will still maintain 6 volts but their amperage capacity will be doubled.
join two 6 vault battaries two make 12 vaults
By connecting two 6 volt auto batteries in series. Or by connecting eight 1.5 volt batteries in series.