I mounted my GMU in the tail. Ran the strobe in shielded cable including the ground return. The wire shield only acts as a shield not a ground return for the strobe. I also ran the stobe sync in a shielded wire. Also did not put any antenas or any other electronic in the tail. I ran the stobe wires in the bottom of the tail with the GMU on top. Trying to keep them as far apart as possible.
Not sure how I would have done this in the wing. The landing lights are higher current and there was not a shielded cable option for these wires.
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