We have 7 Schweiss doors and have only had one stuck open in about 12 years that I can remember.

That is until recently, we added 2 doors on our manure barns and the moisture is getting inside the boxes and causing the doors to not work, many times up on a loader to push contacts to get the door back down!!   :(

Moving the contacts and such to the wall in a water proof box is a good idea.  Thanks.  Never needed to think about it until recently.  

I am also going to change over one of our cable auto lactches to the strap latch.  That looks slick!!