easy dielectric grease Q

No, dielectric grease is not conductive, so it does not improve connectivity. But it wll be displaced by the connection if it is tight enough.

Stolen from the web.
DG is really our friend when it comes to using it on the bulkhead connector, exterior light sockets, and pigtails. Any place where there could be moisture intrusion! I also use it on battery terminals after cleaning them to prevent corrosion.