My alternator has 2 posts on the back that both look the same. Is there a reason I can't run a cable from each post to each battery? (I have 2 batteries) I think this would help me out since I have it set up now as one battery for starting and one for stereo. The stereo battery does not seem to charge well for some reason, even when nothing is turned on. I think it might have something to do with the isolator.