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I don't know the details of your MH, but slides and jacks are often (usually?) run off the engine battery. It's always a good idea to have the engine running when operating them.
Your house batteries are wired to run your 12V lights, water pump, inverter (if you have one), roof vent fans, etc. Basically everything that runs off 12V other than slides and jacks.
Many motorhomes, like my Itasca, have a boost switch that connects the house and engine batteries. Mine is momentary but your's may be on/off and be in the on position. This switch is intended to give your starting battery a boost from your house batteries for starting.
You may have some other sort of interconnect to your engine batteries to give you lighting incase your house batteries go bad or are disconnected. If you have or can download an owners manual, it should explain this.
Since your's is a 2001, I assume there's a previous owner (PO). POs are notorious for making strange mods without any documentation so that could be it as well.
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BobC
2002 Itasca Suncruiser 35U
Workhorse Chassis
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Linear Mode
