Well, not a Merc guy, and not even a pro at all but...
Quick search found that it seems the red adapter was for stators that had 1 coil vs 2 coils and it would allow it to be connected to power packs or similar..
Of course I only say that based on what I read.. I personally have ZERO Idea what it does... LOL
Not sure if they will, but I hope they help (they're older, so probably not a good idea to post in them, but maybe a start?)
Maybe someone with current knowledge will chime in too.. :noidea: