That small black box is your latching relay for your USE/STORE (Battery Disconnect) switch. The small wires just have power applied from the battery when you press the USE/STORE switch - +12 VDC in one direction closes the latching relay and connects the house batteries to the DC buss/converter; + 12 VDC in the other direction disconnects the house batteries. There is usually a small (5 amp) inline fuse on one of the smaller wires that may be blown if the latching relay is not operating.
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Ted & Melinda
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