'88 Bounder 34S
I have an '88 Bounder 34S. The Aux batteries needed replacing so I bought 2 new deep cycle batteries. I tried reconnecting them as they were before I removed the old batteries but now the MH won't start. There is a SurePower Isolator. Only one of the aux batteries was grounded and I suspect the original battery connection was in series. I tried the same coneection and got a few sparks. The new batteries are larger than the old ones. Any suggestions?