[Fulltiming]

I have is an owner's manual from a 1987 40' Newell pdf file that indicates that on 3 axle coaches, 6 sealed, maintenance-free batteries are used. 2 high cranking amp batteries for the chassis and 4 deep cycle batteries for the house. No mention is made of the size category for the batteries. I would measure the compartment and find the largest capacity batteries that will fit meeting the above criteria. No sure when Newell switched to using 2 8D batteries for starting and 2 8D batteries for house but that is what my 1992 had. Both are 12 volt systems and are merged together when the coach is running so the alternator can charge all the batteries as you are driving. Frequently, 4 deep cycle battery systems use 4-6 volt batteries with both pairs individually wired in series to bring the voltage of each pair up to 12 volts, then the pairs of batteries are wired in series to increase the current while maintaining 12 volts.

I have never seen an actual wiring diagram for an older Newell coach. Comments or thoughts are welcome.