[BruceK]

Thanks.
The marine electrician/boat mover who delivered my boat in 2020 texted me a basic diagram but it doesn`t specify the connection to the 2 peripheral batteries. He did say the diagram meant don`t run on "ALL", without saying why,same as the Boat "Manual". I`ll explore that when I get an electrician onboard.
I want to go AGM so 2 peripheral AGMs is preferable,but it`s premature to replace the 8Ds, they can be AGM when due.
Online I got conflicting information about having SLA and AGM on the one charger, from "they`re both LA just do it' to "it will cause under/over charging of one or the other". Thus this thread.