Separating chassis and shore batteries is generally done to prevent draining the chassis battery when dry camping. Of course this also stops shore battery charging when the engine is running. The two systems are isolated
It requires a only 50 cent diode connected from the positive terminal of chassis to the positive terminal of the shore batteries to allow proper charging from the engine. I don't know why this isn't a standard feature on all motorhomes.
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Craig
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2008 Gulf Stream Independence
2010 Ford Focus Toad
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