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That sounds like it might be in the transfer swtich. It may not be switching over from genset back to the shore cord. That can usually be checked with a small digital multimeter once you locate it and get the cover off. IF you happen to have a cord reel, it can be in that as well rather than the ATS. Hopefully, this will prove useful here. Please get back to me if you need more as all follow ups are included in our fee.