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If you are talking about leaving the battery you have as your chassis battery and then adding another to power the house functions, you'll have to determine how intertwined the two systems are. If you find a fuse panel separate from the chassis functions that all the house power, it would be rather simple to use appropriate sized cables to take that from the new battery. You would also have to see how your converter/charger is wired and see if you can add a second battery or install a Tric-L-Start. If using a Tric-L-Start, you would probably wire the house battery directly to the converter/charger and then maintain the chassis battery with the Tric-L-Start.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI