I had to really think about posting this as it can really "stir the pot". Using either dielectric or conductive greases on your electrical connectors is a must to prevent corrosion, arcing and other bad things like fire. I like using NO-OX-ID "A Special" conductive grease on my contacts which includes batteries and power terminals exposed to the elements. I found an interesting information source at www.practical-sailor.com/boat-maintenance/conductive-greases-vs-corrosion/. Basically Dielectric means that it does not conduct electricity but it is displaced from the connection mating surfaces when the connector is plugged in, so it doesn't prevent a connection. The clamping force pushes the grease out of the way. NO-OX-ID is a conductive grease and should be applied carefully to the contacting surfaces to prevent corrosion and lubricate. I started using NO-OX-ID after I tired wrestling my power cord/surge protector connection.
