Why would this happen? I can't imagine it is going to be anything but bad for your motor. I don't have experience with trolling motors but lots of time spent using electric power tools in some lousy weather and sometimes just rain will cause the tools to act up. I am sure the trolling motor is much better sealed but why would it ever be submerged? For an hour? On a flat water trip. I think you need to take measures so this doesn't happen.
Also if I am totally misunderstanding your question I am sorry.
Jim
Also if I am totally misunderstanding your question I am sorry.
Jim