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Do you have a residential fridge? If so, the 'red box' should be an "INVERTER" which is an electronic device that changes 12volt power to 120volt power. If that is the what the red box is, then it probably won't be able to do its job either if the batts are the problem.
If you don't have a res fridge, then I don't have a clue what the red box is...
If you have an RV fridge, it should work fine on propane traveling from one hookup to another.
Let us know more about your setup.
Joe
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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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