The battery is wired correctly (positive ground) and the ammeter is wired correctly according to the Ford 2N/9N service manual (unless the wiring harness is not made correctly). However, the ammeter being wired wrong has nothing to do with the issue. It doesn't matter which way it is wired. If I reversed it then the readings would just be opposite. As for the cutout, the black wire in the wiring harness that goes to the generator is connected to the bottom of the cutout (the side not labeled battery). There is only one black wire in the wiring harness so I am not sure how the wiring harness could be made incorrectly but I will check all of the wires. I agree that it seems like the cutout is wired backwards but it simply doesn't seem possible.
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