Battery disconnect is the Push/Pull knob located in the area of the slide controls--at least, on my '05 that is where it is. Not sure about newer models. If it is pushed in (I think pushed in is off...) nothing 12 volt but the front jacks will work.
If you had the batteries wired wrong, you would have 6-volt power and maybe that is the problem?
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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