FYI, the best way to make the connections weatherproof is something like
http://www.americansealantsinc.com/3...rade-silicone/
Dielectric grease is good if you can assure that you coat EVERYTHING metallic in your connectors.
DO NOT use regular silicone caulkings for this if you are interested in long term reliability - when they cure, they release corrosive fumes such as methanol.