In some coaches the Use/store switch is named master power and has a red light in the center. The red light indicates the switch has power BUT NOTHING ELSE. When on/use the interior light should be on on battery power alone. When off/store you should not be able to turn the lights on. If you have shore power or generator power you will have 12 volt power from the converter to power all the coach. So the master power (off) disconnects the house battery(s) from the fuse panel in the power center. Even with shore power operating the coach, there is no connection to the house batteries in the master power is off. There are some items that are not fused at the power center and may be on all the time. Radio memory, propane detector, inverter. etc. Normal flooded batteries self discharge at the rate of almost 1% per day so in 30 days you would only have 76% of the rated capacity.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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