Wiring harness replacement

We have power at all 3 places on the connector but none at the flasher plug.

Recheck, that you do / do not have power at the flasher with key "in run" and either left or right signal selected.

Then center signal lever and see if power comes back

No power at flasher? First thing I'd backtrack to is a bad fuse or poor connections in the fuse panel / fuse clips etc.