I did not read through all the posts, but did read the OP's questions.
I went with a Hellroaring combiner to handle the dual battery situation. It is all solid state and no loss. It will pass whatever voltage your alt will give. I went with Odyssey AGM's. One on each side of the fenders due to space constraints.
I went with a Hellroaring combiner to handle the dual battery situation. It is all solid state and no loss. It will pass whatever voltage your alt will give. I went with Odyssey AGM's. One on each side of the fenders due to space constraints.