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Hi, sounds like all your batteries are dead (chassis/engine; coach/house). If that is correct then operating the use/store switch will not operate the latching relay that typically connects the converter (power supply that is powered by either shore or generator AC power) 12vdc output to the coach batteries......and once it charges to a certain voltage another relay (called interconnect relay) closes to then also charge the chassis battery on many coaches. I don't know if your coach does this though.
I would suggest getting yourself a vehicle style battery charger and charge your chassis and coach batteries first. Some chargers will not output if the battery they are charging is totally dead (must sense some voltage or they don't turn on). The other alternative is boost start your coach or engine batteries from a vehicle. If you are not electrically inclined.....you might want to ask for assistance from someone who is, as charged batteries can do much damage if you are not careful with cables etc.
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