Hello,
I have a Thor Miramar and didn't know that the switch needs to be in USE not STORE when it's in use and I'm plugged in the house batteries charge and indicate so on the panel reading 13.6 volts.
The engine battery I attached a battery minder I also use one on a PT Cruiser I have had in storage for 4 years. They have a $14 battery minder from Walmart works fine I check it daily and for the last few days it reads green (standby) when it charges it goes to yellow then after a day it reads green again.
I have been using this for 10 months and seems to work fine. It's plugged into a 110 vac landline.
Works for me.
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