I think two batteries are required when you place them correctly behind the passenger seat. It is my understanding they are usually two 6 volt batteries connected in tandem?
Those that have installed batteries behind the passenger seat please clue us in. I plan to S/C-ize my battery set up this winter and could use the information as well.
John, Double Ugly, what was your set up like? You were kind enough to send pics however details I have lost.
Thanks again!