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Whoops! I didn't remove the negative battery cables and really didn't think about it since I have the battery disconnect switch. I have 2 coach batteries that are wired together. I did unplug everything inside the coach but I do realize that are some "hidden draws" on the battery. I will bring a battery charger back with me- hopefully I won't need to jump the batteries and be able to start the coach or run the generator. Thanks for the advice.
You can get an adapter that plugs into the quick disconnect on an air compressor and the other end screws into your fresh water hose. set your air compressor regulator for about 50 psi then go in and open all the faucets one at a time. Do this 2 or 3 times. Takes about 15 to 20 minutes and then you do not have to worry at all about what the temp gets down to.