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I'm no expert on this but if your truck has the tow package it should have an isolator which prevents the fifthwheel from using truck battery when the engine is not running. I don't know if all brand of trucks have this feature but would bet they do.
If the truck is running it may also charge the coach battery. I think that's also a feature of the tow package and may not be available in all brands.
I guess the bottom line is "it depends".
If anyone has better info or I'm wrong, please jump in.
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