Your lights, water pump, furnace, heater, and fridge control boards, antenna amplifier, slide-out motors, leveling jack pump (if so equipped), and stereo (when parked) all run off your 12VDC batteries.
I would highly recommend replacing both batteries, especially if you have leveling jacks as a single battery might not provide enough power to properly lower/raise them.
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The only thing that works on a RV is the owner...
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