If it is the type that has the green button at the top, that is a test button and it must pop back up when depressed. I learned this from a game warden and got a warning because the one in my boat at the top did not pop back up. However, the one in my boat is that style and did pop back up, but I bought another one because I didn't know the age of it and didn't want to take a chance.
__________________
"Many men go fishing all of their lives without knowing it is not fish they are after."