Your Southwind should have its own system for charging the chassis battery from the converter/charger that handles the house batteries. Every Fleetwood Class A I have even seen had such a system. With the battery disconnect engaged, you are isolating the battery form the onboard charging system, so the trickle charger does its thing. With the battery disconnect in normal operating psoition, the house charger should be supplying voltage & current to the chassis battery as needed.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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