Shore power on/battery switch off. come back no power and battery drained completely to charge house batteries disconnect must be on
Your question and facts are a bit terse. Usually when shore power is present you can leave both house and chassis batteries connected so they are charged/maintained by your charger/converter. Using a multimeter, test all parts of the 12v circuits to be sure the converter/charger is outputting at least 13v to house and chassis batteries.
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You must have the battery disconnect switch on (closed) to have any 12VDC function inside your unit. If properly wired, the AC comes into your unit via shore power, goes through shore disconnect box, then to the power inverter [AC => DC], then through the battery disconnect switch before splitting to the batteries and power distribution block (fuse panel). Depending on your unit, there may not be a shore disconnect box. Regardless, the only times you should have the battery switch off (open) is when you have your unit on storage or when performing service/maintenance (to prevent getting shocked). If you leave the battery disconnect switch on while on storage, chances are the batteries will get drained. While you are going over this, consider taking the batteries to a store that can test them to make sure the batteries are not totally dead and cannot be charged. If that is the case, time to buy new batteries.
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