MAP40,
Using the Emergency start switch to tie the two battery systems together did not cause any other damage or problems. The house batteries did not suffer any unusual damage since as soon as I got the low battery light on the dash, I would start the generator to re-charge, maintain the batteries. This also charged the chassis batteries since they were still tied to the coach betteries. Also the batteries did not fully discharge since the warning light comes on when the voltage drops a small amount. I am not sure what the level is, but it is still high to start the generator or even the engine if needed within about 30 minutes of first seeing it come on.
Doug