i run 2 batteries in series for 24 volt to go to the starter. i pull all the 12 v electronics off the first positive post to run the 12 volt stuff. I've been running 2 5 pole relays that switches the charger back and forth between the two batteries with mixed results. I'd like to hook up a 24 volt charger and be done with it, but I'm not sure how that will affect my 12 volt components when the charger is on. I've attached a diagram of my current (no pun intended) setup. My intent is to run the 24 v charger to post A and D to charge both batteries at the same time.