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Andy,
Hope you don't mind - the "external" battery(ies) are called the "coach" or "house" batteries. The "engine" battery is usually referred to as the "chassis" battery.
I believe everything in the console draws from the house batteries. I've tested most, but not all of it while trying to track down parasitic loads. You can test an outlet by plugging something into it and then setting the Use/Store switch to the "Store" position. If the device shuts off, stops charging, whatever you know that outlet is drawing from the house batteries.
In general, the chassis battery serves only normal automotive functions: starting the engine, head, tail, signal, and marker lights, etc. Basically things you don't use unless the engine, and more importantly the alternator, are running. The idea is that you don't want house loads drawing down the chassis battery and leaving you stranded.
Regards,
Randy
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