Emergency start switch
Everybody has different systems, but on my 2017 Vegas 24.1, the emergency start switch must be held down for several minutes so the coach batteries can quick charge the chassis battery. You'd think it was just a relay to "shunt" all the batteries together, but my dealer says otherwise. If your chassis battery is close to three years old and you don't run your engine every month or so, it will go bad and you just have to jump it off which is way tedious because the battery is so inaccessible, then install a new battery.
There has been a lot of discussion about how the systems that charge the house batteries also charge the chassis battery. Not true for my rig. Plugging into shore power does not keep the chassis battery topped off - again, that's the way mine is wired. Some keep trickle chargers on the chassis battery.
__________________
|