Coat all the connections with dielectric grease, available at any good auto parts store. Your always going to get water places where it shouldn't be, so sealing up all the connections is not a great idea, you want the moisture to be able to dry out and also you want to be able to get to the connections if you need to without cutting anything. Just get a tube of dieletric grease and put it in every connection you can get at under the hood, and under the body. It's been working for me for years now, and it's wetter n' hell in NJ. My 2 cents.