Ok car has one 12v Braile battery now.While it cranks over so so,its not as strong as it needs to be. I can add second 12v and cars is setup for it.Next option is 16v battery. Have heard lots swear by 16v. I know its not wiring.Same voltage at starter as at battery,used o wire thru out. Starter being problem is possible 2 braile's weigh almost same as 16v.While adding weight sucks,it is in front of axle center line,so not terrible.
Wondering what others are running with on board battery?