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the battery disconnect switch activates a solenoid which switches the battery circuit on and off. The solenoid is subject to failure and if it does, the switch will do nothing. A second possibility is that the house batteries are dead. You shut off the batteries with the disconnect switch but there are a number of other loads that are not disconnected by the battery shut off switch in most coaches. Some of these parasitic loads include the smoke/carbon monoxide/propane detectors, various electronic indicators and other things the manufacturer may have wired outside the battery cutoff circuit. They are small loads but may in a weeks time completely discharge the battery.
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