I need the basics here. I have a 97 Searay jetboat. About 2 weeks ago, it took on water. I found 1 of the drain plugs we're stripped out. And, the fuse for the bilige pump was blown. I replaced the fuse. Sitting the trailer, when you hit the switch, should you hear the bilige pump kick in?? Because I hear nothing. Or, does it only work when water start filling in.