I have a 3 bank cul m rite on my cat. The bank that goes to the cranking battery is shot, (tried everything and think its just gone). The other two banks are fine. Should I just get a single bank (any suggestions) Or a manual (brand suggestions) I know Lesters are nice, but surely a cheaper manual would work for a single. My cranking battery is an AC Delco and I just cant seem to kill this battery. I have Sears for my trollers and they rock, but the Delco wont die.