First, I'm not very mechanically inclined like most of you. Second, I searched many threads on this issue but have not found info on excatly what I'm looking to do. I want to install dual batteries in my '72 but put them in the back of the blazer behind the rear seat to the side with an isolator or selectable switch to have "on" "off" "Batt. 1" "Batt. 2" or "both" options. Is there a problem with the batteries charging or just working properly being that there would be about 10' - 12' of battery wire running between the batteries and the alternator and other components? Charging issues? What gauge wire is typically run with these distances to keep the amps up. Anything else special to consider? Thanks for the help in advance. Pics would be cool if you have. does any one have a diagram they could lead me to for the wiring.