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Do you have the harness routed correctly?
If the lights only work with the engine running then you have the lights/horn wire terminal on the wrong side of the cutout. It goes on the output side, which is the same side with the wire running up to the terminal box.
The input side of the cutout should ONLY have the connection to the generator output stud, or generator output wire if you are using a later generator (post Model A production).