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Thank you gmc. Of course. I didn't think of it that way, but when you tie two batteries together to jump start one, the current flows between the two to try to equalize them. So the same thing should happen when they are charging. The charger does not have to sense anything because the whole system will try to reach equilibrium. That also answers my second question. If the chassis battery is near full charge, then it does not need to be isolated from the house batteries while charging them because the three batteries will equalize and then charge together. While the chassis battery may end up at a lower charge than when you started, basically all the amps will go into the coach batteries until you reach the voltage that the chassis battery was when you started. That makes things much simpler. I knew I was missing something. Thanks for the help.
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