Groundhog is right.
As a side note, we use a specially designed dielectric grease at work on our aircraft. It is also good for a variety of other uses being silicon based. I personally prefer this type to others as its usage is a little broader.
This is what we use (Dow Corning 4 Electrical Insulating Compound
) and a tube for home use will last quite a while...
. A 5.3 oz tube (about large toothpaste tube amount) will run you about $15.00 from various on-line retailers. Look for "Dow Corning DC-4".
The above specific compound of "DC-4"
could be used on the connections as it is designed for that, but only use a thin film of it.