CONVERTERS: WF-8900-AD MBA SERIESWF-8900-AD-MBA Main Board Assembly Series will charge the 12-volt House battery when installed. A battery DOES NOT have to be installed for WF-8900-AD-MBA Main Board Assembly Series to operate. Two reverse polarity fuses protect the MBA circuitry after battery installation. The fuses are located along the left-center edge of the dc fuse board below the VCC+ lug. In preserving the MBA, the reverse polarity fuses are the primary connection between the MBA and the dc fuse board. This Auto-Detect feature prevents permanent damage to the MBA from a battery connected to the circuit backward.
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