Whatever you do....do NOT try to make a 24 V system out of the two batteries you have!! Your big motor is only 12V and like others have said, if you put 24V on some of those systems, or your electronics, you will soon find yourself facing a very large repair bill. The two systems have to be kept seperate, so if you want 24V, you will have to have another battery to go with the TM battery you already have....please do a lot of research before you plug anything new in.