I've not heard or seen a box with relays as you describe. The house batteries might have a solenoid to isolate them from the fuse panel, but the lights, control panel, refrigerator are usually fused in the house fuse panel. Often the fuse panel for 12 v systems is located right with the converter/charger. Check inside, under refrigerator, bed, etc. After or before the battery isolation solenoid, there might be a large, resettable circuit breaker to protect the 12 v system.
The converter(or inverter)/charger is powered by 120 v shore cord or generator, it would powered through a circuit breaker on the 120 v AC panel.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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