Question on wiring three batteries to a 24 volt trolling motor/

[billwv68]

I would like to know, if possible, how to wire a third battery to a 24 volt trolling motor so to increase the amount of charge.  I have a friend that has his cranking battery directly connected to one of his trolling motor batteries so he can charge two batteries while the big motor is running.  

Right now I have added a third battery to my back compartment and would like to know how to connect it to the other batteries without throwing 36 volts to the trolling motor.

[slice]

Check out this link. There are some helpful diagrams.

http://www.boatfix.com/how/Ele2.html

Also, do a search for "battery isolator."

[Wayne P.]

PM sent

[George Welcome]

Two batteries parallel and then those two in series to the third. That will increase amp hour for the parallel batteries but I don't know about the disparity of the setup in series. It is generally recommended that batteries in a pack have the same capacity, both in voltage and amp hours.