Just one word of caution on batery isolators. Check your charging voltage first, as most isolators will drop the voltage out to the batteries by nearly 1 volt. If your sport is like mine and charges at around 14.5 volts this will be fine, but if you currently charging at under 14 volts you will likely have a problem after the isolator. I personaly prefer to use high current relays. A relay when the connections are properly done will not result in any voltage loss, also remember to install a fuse near both of the batteries, especially if you are running wire thru the body. I am not trying to discount the isolator, I just wanted to show an alternative, especially if you have a lower charging voltage.