If you have 4.8 VDC at the inverter input that reads 12.8 VDC when the cables are disconnected from the inverter, AND the battery terminals read 12.8 VDC whether the cables to the inverter are connected or not, you have a high resistance connection between the batteries and the inverter. Time to use the voltmeter and find out where the other 8 volts are dropped. Until you find this problem you can not pronounce the inverter dead, or even non-working.
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Ted & Melinda
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