The 24v systems that employ 12v batteries can be recharged with a 12v alternator by simply being plugged in like any other 12v battery.
Charging 24 volt system.
The most popular way to charge a 24 volt trolling motor battery system is with an onboard two bank battery charger like the minn kota mk220d.
Ever wonder about how to charge the 24 volt battery system on an mci motorcoach bus.
If your charger is small enough to be carried aboard your boat you can leave these cables in place since the charging procedure requires it.
Cars trucks rvs and motorhomes run dual 12 volt batteries for various reasons.
Most alternators generally have two sometimes three wired connections depending on the type of alternator.
Depending on how you wire a two battery 12 volt system the result can be a 12 volt system or a 24 volt system.
If your boat has a 24 volt battery system it probably has two 12 volt batteries that are wired together so that the negative post of the first battery connects to the positive post of the second battery.
Another option for charging your 24 volt battery bank is to use a 24 volt charger like the samlex sec 2425ul.
Some 24v systems actually employ a series of linked 12v or 8v batteries.
If you have a two wired alternator you only have one 24 volt.