The chassis batteries are still connected and a draw down is possible. Battery disconnect switchpositive or negative here is the heartland engineering drawing showing how they wire the disconect switch from the factory.
Modification Battery Disconnect Switch Install
Rv battery disconnect positive or negative. They are cheap and take only a few minutes to install. Bob joyce krull. When reconnecting red first. For a single 12 volt battery placing a disconnect switch is usually pretty simple. Nhra rules still mandate a positive side hookup. You can simply remove the negative lead from your battery but a better solution would be to install a manual disconnection switch.
Theres considerable controversy over whether its best to hook up the master shutoff kill switch to the batterys positive or negative side. Positive cable first red 1 then the ground black 1. Whether it be a top post or side post disconnect switch. Typically the safest position is on the negative terminal wire between the battery and where the negative black wire connects to the framechassis of the rv. Yes it can be on the positive terminal as well but usually theres a fuse block of some sort there which can make placement challenging. This additional surface area can more.
Soooo add another disconnect switch. The important things to note is that when the switch is off the truck can still charge the battery and most importantly the breakaway switch will still work. All battery disconnect switches add additional exposed area to the terminal it is connected to. If you only have one battery disconnect switch that is for the house only. Well michguy maybe a spartan can give you an answer.