I suspect there is a small difference in the internal wiring of the generator, in your new generator the case/frame are not bonded to the ground wire, they are seperately wired through that 'extra' wire.

Since your genset and cabin's wiring are miles from the grid, I can't think of any reason why you can't merely put the new twist lock plug on the old wire and just use a small jumper cable to connect the 'extra' wire on the new plug to the neutral.

If you check the owner's manual it may even tell you to do this in a circumstance like yours. I seem to recall seeing something like that in mine, but it's 120 miles away so I can't look it up right now.

Best ofluck.

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