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Reverse Polarity Light when running Generator


OK here's a weird one for those of you that understand AC power better than I do. I have a '97 400 with twin 30 amp inputs and a 4.2k westerbeke generator. No issues on shore power. No issues on Generator with panel one (galley, outlets, HWH, charger). On the Air Conditioning panel no issue when I run the pump or the forward AC unit. But when I turn the rear unit on I, the reverse polarity (red) light comes on. This only happens when the generator is running. Any ideas?

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