I have a AE power winder FN.
I believe I may have managed to fry 3 of these in less than a week…
I bought these years ago.
I do not remember having issues with attaching the FN motor drives or loading batteries in the past But apparently these are extremely delicate when you load the battery pack in the camera.
I had the mode selector to off but not on the camera…
I seriously do not remember these being so finicky.
All three F1s are doing this. They will fire from the shutter button on the camera but not the mode selector on the motor drive.
Anyhow… I cannot believe no one else has fried theirs in the same manner as I can load any other camera drive without issue.