There is lots of discussion about this "feature". The short story is the disconnect switch doesn't disconnect everything and those remaining draws will drain the battery in a short period. The answer is to disconnect the battery at the battery ground cable.
Do a Search on 'battery disconnect" to learn more about why this happens.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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