311 sr-1. Need to add a 3rd battery. I have reviewed the posts in technical (and come up with my old questions last year!!!!) If any of you old straight bottom guys and gals added a 3rd battery to your system with a single switch ala my old 311, let me know how you did it, what you used and what the results were. I killed another battery last time out and need to add a 3rd battery to one side (that has the sub amp wired to it).