[rcbildr]

[QUOTE=cr34t3d_by_d4rkd3n;4887806]i hate this idea. whats the point of having a seperate battery? u want more consistant voltage and more amperage? run 2 batterys in parallel and call it good. if not ur just drGging abound 70lbs for what?? " if u need it??" an alternator loves 2 batterys. its not harder on it.. its eaiser. less draw=less to recharge.[/QUOTE

It comes in handy on trucks with campers. You can run the camper off one battery and still be able to start the truck on the other one. Somebody correct me if I'm wrong, but I think usually the 2nd battery (the one that runs the camper) is a deep cycle battery and the other is just whatever you need to for the vehicle...it can be done that way because of the isolater. I have a camper on my C30 that I want to set up this way when time an money allows.

On my diesel burb I need 2 batteries to start the truck and they are wired in parrallell..although in reality I can get away with just one battery...gotta luv the optima red tops.